service, repair, ITB/ITCB/HV, ICB/TWIN Service & Repair Manual
Contents
1. 19 DV Selector 21 terse adie aa nS tain aie anaes 22 Schematic Wiring 23 42461 081310 TROUBLESHOOTING A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems encountered If the problem remains after exhausting the troubleshooting steps contact the Bunn O Matic Technical Service Department Inspection testing and repair of electrical equipment should be performed only by qualified service person nel All electronic components have ac line voltage and some have low voltage dc potential on their terminals Shorting of terminals or the application of external voltages may result in board failure Intermittent operation of electronic circuit boards is unlikely Board failure will normally be permanent If an intermittent condition is encountered the cause will likely be a switch contact or a loose connection at a terminal or crimp Solenoid removal requires interrupting the water supply to the valve Damage may result if solenoids are energized for more than ten minutes without a supply of water The use of two wrenches is recommended whenever plumbing fittings are tightened or loosened This will help to avoid twis2. LI M ICB TWIN Infusion Series SERVICE amp REPAIR MANUAL BUNN O MATIC CORPORATION POST OFFICE BOX 3227 SPRINGFIELD ILLINOIS 62708 3227 PHONE 217 529 6601 FAX 217 529 6644 www bunn com ay 42461 0000C 06 12 2010 Corporation COMMERCIAL PRODUCT WARRANTY 0 Corp BUNN warrants equipment manufactured by it as follows 1 Airpots thermal carafes decanters GPR servers iced tea coffee dispensers MCP MCA pod brewers thermal servers and Thermofresh servers mechanical and digital 1 year parts and 1 year labor 2 All other equipment 2 years parts and 1 year labor plus added warranties as specified below a Electronic circuit and or control boards parts and labor for 3 years b Compressors on refrigeration equipment 5 years parts and 1 year labor Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis parts and labor for 4 years or 40 000 pounds of coffee whichever comes first These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the applicable warranty period This warranty does not apply to any equipment component or part that was not
3. Initiate brew cycle and check the water temperature immediately below the sprayhead with a ther mometer The reading must not be less than 195 F 91 C Adjust the temperature setting to increase the water temperature Refer to Initial Set up instructions BUNN paper filters must be used for proper extraction A fine drip or grind must be used for proper extraction The BUNN paper filter must be centered in the funnel and the bed of grounds leveled by shaking gently Make sure sprayhead is present and holes are clear and unobstructed The BUNN paper filter must be centered in the funnel and the bed of grounds leveled by shaking gently Preheat server 42461 081310 DIAGNOSTICS MESSAGE PROBABLE CAUSE REMEDY Temperature Low 1 Water temperature in the tank Wait for the brewer to heat to does not meet the ready tempera the proper temperature ture B Disable the BREW LOCKOUT function Refer to programming section for procedure Heating Time Too Long 1 Tank Heater failure Replace or repair as needed 2 Control Board Thermistor fail Replace or repair as needed ure Fill Time Too Long 1 Water shut off to brewer Check water supply shut off 2 Supply line too small or ob Replace or repair as needed structed 3 Inlet Solenoid failure Replace or repair as needed 4 Control Board Failure Replace or repair as needed 5 ON OFF switch is OFF Turn switch ON Temp Sensor Out Of Ra
4. Load Component Optional Funnel Lock Refill solenoid Brew Solenoid Tank Heater s Dilution or Bypass Solenoid Connector 17 13 17 14 Relay Terminal J17 1 42461 081310 45 1 1 Z DOWN BREW SW ENABLED l 2 9 1 a 5 HEATER BUNN O MATIC 941 PUL 41849 ROHS FIG 14 1 TRIAC MAP Triac Load Component Connector TH1 MOV3 Main or Left Dilution J10 1 TH2 MOV1 Refill solenoid J10 2 TH3 MOV2 Brew Solenoid J10 3 TH4 MOV4 Right Dilution J10 4 TH6 MOV6 Sweetner J10 5 TH7 MOV7 Tank Heater TR1 TR6 14 42461 081310 5 FIG 15 1 MEMBRANE SWITCH Location The Membrane Switch is located on the front face plate Test Procedures There are two methods for testing the membrane switch The easiest method is to use the built in test mode Refer to the Programing Section for Service Tools Test Switches If for some reason you can t get into the program modes or brewer won t power up you test it with ohmmeter or continuity tester Refer to the schematic to trace the appropriate pins NOTE Pin 22 is the static shield amp will not provide a reading to the other pins There are two commons in this circuit pins 9 amp 10 Disconnect brewer from power source before d
5. 1 Disconnect the brewer from the power source 2 Disconnect the three wires from the selector switch 3 Remove the switch mounting nut from the under side of component mounting bracket remove switch from bracket 4 Install new switch component mounting bracket and secure with mounting nut FIG 24 1 VOLTAGE SELECTOR SWITCH Location The voltage selector switch is located on the component mounting bracket on the base plate Test Procedure 1 Disconnect the brewer from the power source 2 Disconnectthe wires fromthe selector switch With the selector switch in the 120V position check for continuity between the two right terminals of the switch 3 With the selector switch in the 120 208 240V position check for continuity between the two left terminals FIG 24 2 VOLTAGE SELECTOR SWITCH TERMINALS If continuity is not present as described replace the switch 24 42461 081310 5 Removal and Replacement 1 Disconnect the brewer from the power source 2 Disconnect the wires from the power switch 3 Remove the switch mounting screws from the left side of trunk 4 Install new switch in trunk with the two 6 32 x 1 4 mounting screws FIG 25 1 POWER SWITCH ICB SHOWN Location The power switch is located on the lower right side of the trunk ICB or lower rear panel ITCB Test Procedure FIG 25 2 ROCKER SWITCH 1 Disconnect the brewer from the power
6. THERMOSTA BLK 14 TANK HEATER RED 14 RED 14 oOJrOoOw C2 gt CC FUNNEL SENSOR VI one 0 BLU 14 COMP 0 WHI GRN WHI GRN WHI BLU TRANSFORMER J15 5 J13 1 J3 8 2 1 42 5 HALF FULL ON OFF 18 1 Early Models only 9 1 200V AC 2 WIRE 230V AC 2 WIRE SINGLE PHASE 19 7 36460 0001C 08 09 2004 BUNN O MATIC CORPORATION 27 42461 081310 SCHEMATIC WIRING DIAGRAM ITCB DV 8 ITCB C DV i MAIN ON OFF SWITCH Late Models only BLK 18 LIMIT SELECTOR THERMOSTAT 1425W ITCB C DV ONLY BLK 14 3 8LV 14 LI 1 8 3 9 I 8 14 BLK WHIMIO 14 14 5 FUNNEL SENSOR 1800W 8 ers OPTIONAL SWEETENER 0 BLU 14 KIT I H N BLK 14 T DILUTION VIII L WHI GRN WHI GRN O WHI P REFILL welu VIVI 8L WHI B 0 R D J17 10 0744 TRANSFORMER E Early Models only 120V AC 2 WIRE 120 208 3 WIRE 120 240 3 WIRE SINGLE PHASE 36460 0003A 06 08 2008 BUNN O MATIC CORPORATION 49 7 28 42461 081310 SCHEMATIC WIRING DIAGRAM ITCB DV amp ITCB C DV Chassis Ground
7. manufactured BUNN or that in BUNN s judgment has been affected by misuse neglect alteration improper installation or operation improper maintenance or repair non periodic cleaning and descaling equipment failures related to poor water quality damage or casualty In addition the warranty does not apply to replacement of items subject to normal use including but not limited to user replaceable parts such as seals and gaskets This warranty is conditioned on the Buyer 1 giving BUNN prompt notice of any claim to be made under this warranty by telephone at 217 529 6601 or by writing to Post Office Box 3227 Springfield Illinois 62708 3227 2 if requested by BUNN shipping the defective equipment prepaid to an authorized BUNN service location and 3 receiving prior authorization from BUNN that the defective equipment is under warranty THE FOREGOING WARRANTY IS EXCLUSIVE AND 15 IN LIEU OF ANY OTHER WARRANTY WRITTEN OR ORAL EX PRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE The agents dealers or employees of BUNN are not authorized to make modifications to this warranty or to make additional warranties that are binding on BUNN Accordingly statements by such individuals whether oral or written do not constitute warranties and should not be relied upon If BUNN determines in its sole discretion that the equipment does not conform to the warranty BUNN a
8. source 2 Disconnect the wires from the power switch With the switch in the ON position check for continuity between the upper and lower terminals on each side of the switch There should be continuity between the two left ter minals and between the two right terminals when ON FIG 25 3 TOGGLE SWITCH no continuity when OFF If continuity is not present as described replace the switch 25 42461 081310 SCHEMATIC WIRING DIAGRAM RN ITCB DV amp ITCB C DV MAIN ON OFF SWITC Late Models only BLK 18 LIMIT SELECTOR THERMOSTA SWITCH BLK 14 1 810414 WHI 14 VIMIIVI0 14 TANK HEATER RED 14 1680W 5 FUNNEL SENSOR 1425W ITCB C DV ONLY Ferre WHI VIO comp BLU 14 WHI GRN WHI GRN so WHI BLU WHI J17 5 WHI BLU REFILL 2 XC C VrODHZOO 17 10 17 14 15 1 TRANSFORMER J15 5 J13 1 43 1 43 5 43 8 42 1 42 5 2 15 HALF FULL J2 20 ON OFF 2 22 5 Early Models only 120V 2 WIRE 120 208V AC 3 WIRE 120 240V AC 3 WIRE SINGLE PHASE 36460 0000D 02 07 2004 BUNN O MATIC CORPORATION 26 42461 081310 SCHEMATIC WIRING DIAGRAM Li GRN YEL 12 EM i FILTER BLK A RED BLK RED LIMIT
9. upon the problems experienced by the brewer Refer to the Troubleshooting section which is divided into three sections Refill Circuit Heating Circuit and Brewing Circuit Check for Power to board 1 Insert one meter lead in J17 pin 9 and the other lead in J17 pin 11 2 With the power connected to brewer the voltage reading to the board should be the line voltage rated for that model If no voltage is present check wiring to the board If voltage is present and brewer does not power on go to step 3 3 Check for line voltage at J15 1 BLK to J15 2 WHI If no voltage is present replace the control board If voltage is present go to step 4 4 Check for 12VAC at J15 4 to J15 2 Yellow wires J14 4 to J14 5 ITB only If no voltage is present replace the trans former If voltage is present and brewer does not power on replace the control board Removal and Replacement 1 Disconnect brewer from power source 2 Disconnect the wires from the relay on the control board 3 Disconnect all of the connectors from the control board 4 Remove the two nuts securing the control board to the hood 5 Tilt the control board inward to clear the display section 6 Place the bottom edge of the new control board in the cradle tilt the board forward and secure with the two nuts to the hood 7 Re install connectors Faceplate Removal and Replacement 1 Disconnect brewer from power source 2 Disconnect the ribbon
10. 1841 120 2 120 208 3 WIRE 120 240 3 WIRE SINGLE PHASE 37299 0000B 02 07 2004 BUNN O MATIC CORPORATION J9 7 30 RED 14 WHI RED BYPASS WHI GRN WHVGRN WHI BLU WHI BLU 42461 081310 SCHEMATIC WIRING DIAGRAM ICB TWIN GRN L MAIN ON OFF SWITCH Late Models only BLK 18 LIMIT THERMOSTAT PNE BLU 14 4 LEFT 59555225 FUNNEL SENSOR 13 THERMOS 20 1 97 420 3 WHIO LEFT RIGHT FUNNEL SENSOR or WHI Ana ip 3 s RIGHT C 1 VII 0 BLU 14 como eer R ee WHVRED DISPENSE wal L WHI GRN 5 6 MMI 8L B BLU RIGHT 8LL WHI GRY J17 10 a BRN BLK 017 14 FUNNEL LOCK 1 Optional J15 1 TRANSFORMER 15 5 J13 1 J3 5 CONTROL PANEL ASSY J3 8 19 RIGHT J RIGHT FULL HALF RIGHT RIGHT BREW J ON OFF RIGHT RIGHT Je BREW 1 Jot 97 2 5 2 10 2 15 5 SHIELD 120 208 OR 120 240 VOLTS AC 3 WIRE GND SINGLE PHASE 37299 0001C 02 07 2005 BUNN O MATIC CORPORATION 31 LEFT PROG PROG WN ON OFF Digital LEFT t CW FULL LEFT LEFT BREW PROG c 4 1 HALF LEFT BREW RIGHT ON OFF ON OF
11. 20 FIG 20 2 DV TANK HEATERS HEATER 1425W 120V 3500W 240V 1680W 120V 1800W 120V 2268W 120V 3000W 208V 3000W 240V 3500W 200V 12 9 15 10 17 9 20 7 10 5 12 20 TERMINAL TO SHEATH INFINITE OPEN NOTE If any resistance is read between sheath and either terminal remove and inspect heater for cracks in the sheath Removal and Replacement 1 Remove the top cover and front access panel as previously described 2 Drain water from the tank 3 Disconnect all the hoses from the tank 4 Remove the temperature probe from the grommet in the tank lid Remove the level probe from it s grommet Disconnect the green wire from the tank lid Disconnect the wires from tank heater terminals Remove the nuts securing the tank lid to the tank 9 Remove the hex nuts securing the tank heater to the bottom of the tank Remove tank heater s with gaskets and discard Install new tank heater s with gaskets to the bot tom of the tank and secure with two hex nuts 11 Install tank lid and secure with nuts 12 Reconnect the wires to tank heater terminals CoN 1 42461 081310 LIMIT THERMOSTAT FIG 21 1 LIMIT THERMOSTAT Location The limit thermostat is located on the tank lid on the front of the tank on twins Test Procedures 1 Disconnect the brewer from the power source and allow to cool 2 Disconnect the wires from the limit thermostat 3 With an ohmmeter check for c
12. F 43 RIGHT 1 EFT 1 FULL FULL RIGHT HALF LEFT HALF Brewer 42461 081310 SCHEMATIC WIRING DIAGRAM 1 GRN YEL LIMIT THERMOSTAT BLU 14 FUNNEL SENSOR et 0 BLU 14 WHI RED WHI GRN WHI GRN WHI BLU WHI BLU oop RED J17 5 C C C VrODHZOO FUNNEL LOCK Optional TRANSFORMER J15 5 J13 1 48 1 42 5 9 ON OFF 841 IL Early Models only 200V AC 2 WIRE 19 1 230 2 WIRE SINGLE PHASE J9 7 37299 0002B 08 09 2005 BUNN O MATIC CORPORATION 32 L2 42461 081310 SCHEMATIC WIRING DIAGRAM ICB TWIN 230 ss Ground C C C2 gt CC GRN YEL RN co BLOCK EMI FILTER Chassis Ground BLK 18 LIMIT TANK HEATER RED 14 LEFT FUNNEL SENSOR TANK HEATER ie J20 3 RIGHT LEFT FUNNEL SENSOR 3 BYPASS RED YE Irora YEL 21 3 so Pore RED BLU 14 como LEFT WHI RED DISPENSE RED III 1 1 WHI GRN REFILL WHI BLU BUY i BLU RIGHT BLU BLK FUNNEL LOCK Optional RIGHT BL 55 GRY 217 10 14 J17 LEFT 017 14 FUNNEL LOCK Optional J15 1 TRANSFORMER 415 5 J13 1 J3 1 J3 5 a 2 MI 0L PA
13. MAIN ON OFF SWITCH WITH FACTORY SWEETENER Late Models only BLK 18 BLK 14 LIMIT SELECTOR THERMOSTAT SWITCH BLK 14 4 BLU 14 BLk 14 BLU 14 ig UNA BK ______ 1680W 0 14 14 gt vio FUNNEL SENSOR 1425W ITCB C DV ONLY 180011 44 1 c WHI VIO 0 BLU 14 N K 14 soa DILUTION R WHI VIO WHI VIO WHI 0 J17 1 L WHI GRN WHI GRN Gap REFILL WHVBLU WHI BLU WHI B 0 A BRN WHI SWEETENER R D J17 10 37 14 TRANSFORMER LOW PRODUCT DETECT SWITCH J16 1 J16 5 120V 2 WIRE 120 208 3 WIRE 120 240V 3 WIRE SINGLE PHASE 36460 0004A 10 08 2008 BUNN O MATIC CORPORATION J9 7 29 42461 081310 SCHEMATIC WIRING DIAGRAM ICB DV MAIN ON OFF SWITCH Late Models only BLK 18 BLK 14 LIMIT SELECTOR THERMOSTAT WHI 14 BLK 14 1 181114 T 9 BLK 14 1 1680V WHI VIO 14 5 FUNNEL SENSOR 2268W 04 VI Ferme WHI VIO BLU 14 comp 9 8014 0 N T R 0 L 0 17 1 17 5 17 10 BRN BLK FUNNEL LOCK Optional TRANSFORMER J15 5 J13 1 48 1 43 5 43 8 4241 42 5 ON OFF HALF FULL J2 20 ON OFF Early Models ony
14. NEL ASSY 238 RIGHT J RIGHT FULL HALF 12 1 2 RIGHT 1 RIGHT 4 BREW ON OFF J2 5 PROG J2 10 RIGHT BREW 12 15 PROG a ON OFF Brewer LEFT FULL LEFT 1 PROG 4 HALF RIGHT ON OFF i RIGHT FULL 4 i Py RIGHT 7 HALF LEFT HALF STATIC SHIELD 230 VOLTS 2 WIRE GND SINGLE PHASE 37299 0004A 12 08 2008 BUNN O MATIC CORPORATION 33 42461 081310 SCHEMATIC WIRING DIAGRAM ITB SINGLE amp DUAL DILUTION MODELS AND MODELS w OPTIONAL SWEETENER TR 1 0 8 8L 9 an DILUTION WH 4 WHI BLU en WHI GRN DISPENSE 2 WHI Neat RIGHT DILUTION DUAL DILUTION MODELS ONLY WHL WHI TRANSFORMER 10VA TEMP PROBE OPTIONAL LOW PRODUCT DETECT SWITCH JUMPER FOR DUAL DILUTION MODELS ONLY JUMPER FOR SWEETENER MODELS ONLY JUMPER FOR DUAL DILUTION MODELS w SWEETENER ONLY MEMBRANE SWITCH ASSY STATIC SHIELD 120V AC 2 WIRE GROUND SINGLE PHASE 42377 0000B 12 09 2009 BUNN O MATIC CORPORATION 34 42461 081310 SCHEMATIC WIRING DIAGRAM ITCB DV Earth Ground Chassis Ground MAIN ON OFF
15. ONTROL PANEL ASSY LEFT ON OFF LEFT FULL LEFT HALF RIGHT ON OFF RIGHT FULL RIGHT HALF STATIC SHIELD 120 208 OR 120 240 VOLTS AC 3 WIRE GND SINGLE PHASE 44145 0000A 01 11 2011 BUNN O MATIC CORPORATION 36 oye WHI YEL sou LEFT DILUTION COOLING FAN RIGHT PROG Control PROG Digital LEFT ON OFF 1 37
16. SWITCH BLK 18 BLKT4 LIMIT TERMOSTAT SELECTOR SWITCH 7 BLK 14 ENA BLU 14 j 1680W 14 RED 14 edna SACS z FUNNEL SENSOR 2268VV Woe 0 te COOLING FAN 0 BLU 14 comp WHI R WHI RED WHI A DISPENSE L WHI GRN WHI GRN WHI wiv WHI BLU WHI 0 A DILUTION WHI 07414 15 1 TRANSFORMER J15 5 COOLING FAN THERMISTOR 3 5 CONTROL PANEL ASSY 42 1 12 5 FULL ON OFF STATIC are Teste dank Me Av Stans 018 1 120 2 120 208 AC 3 WIRE 120 240V 3 WIRE SINGLE PHASE 43828 0000A 11 10 2010 BUNN O MATIC CORPORATION J9 7 35 SCHEMATIC WIRING DIAGRAM TWIN Earth Ground LIMIT BLU 14 LEFT FUNNEL SENSOR 20 1 1 BLU 14 420 3 RIGHT FUNNEL SENSOR f YEL Iree 191 3 COMB 17 1 WHI GRN WHI BLU 21 1 RIGHT DILUTION RELAY MAIN ON OFF SWITCH Chassis Ground BLK 18 TANK HEATER TANK HEATER LEFT BYPASS LEFT DISPENSE REFILL RIGHT UDEOWO 4 D BLK U BLK LEFT DILUTION RELAY eel BLK TRANSFORMER BLK C
17. cable from the control board 3 Models with faucet Drain tank to below faucet outlet fitting Remove hose nut and washer from faucet Remove faucet assembly 4 Remove the four screws securing the face plate to the hood 5 Carefully pull the ribbon cable through the front Opening of the hood 6 Installation is the reverse order FIG 11 2 FACEPLATE REMOVAL 42461 081310 CONTROL BOARD ICB TWIN ITCB TWIN HV TRIAC lt M0V6 M0V7 Move IM8 UNLOCK 5 144 1431 ozr Triac TH1 MOV4 BR2 TH2 MOV1 TH3 MOV3 BR3 TH4B MOV2 TH5 MOV5 TH6 MOV7 TH7 MOV8 TH8 MOV6 BUNN O MATIC 37789 ROHS FIG 12 1 TRIAC MAP Load Component Left Funnel Lock Refill solenoid Right Funnel Lock Tank Heaters Left Brew Solenoid Right Brew Solenoid Left Bypass Solenoid Right Bypass Solenoid Connector J17 13 J17 14 J17 5 J17 6 J17 7 Relay Terminal 42461 081310 CONTROL BOARD ICB ITCB TRIAC Triac TH2 MOV1 BR2 TH4B MOV2 TH6 MOV4 TH7 MOV3 TH9 MOV5 J15 BUNN O MATIC 36373 ROHS FIG 13 1 TRIAC MAP
18. d is heard as described there be a blockage in the valve hose tank or sprayhead Disconnect the brewer from the power source Remove the valve and inspect for blockage and de lime all related areas 4 Connect the voltmeter leads to the coil terminals Turn on the valve with the test mode The indication will be 2 3VAC off 120VAC on Set the meter to DC volts The indication should be 150 160VDC when off OV when on Ifthe polarity of meter leads reversed reading will indicate 150 160VDC Double these readings for 240 volt coils If voltage is present as described but no coil action is observed brew valve is defective Replace valve and test again to verify repair voltage is not present as described refer to Wir ing Diagrams and check the brewer wiring harness Also check the control board and switch for proper Operation Removal and Replacement 1 Disconnect the brewer from the power source 2 Disconnect wires from the valve 3 Drain enough water from the tank so the water level is below the outlet 4 Remove hoses from the valve 5 Remove the two 8 32 nuts securing the valve to the sprayhead panel 6 Install new valve using the two 8 32 nuts 7 Reconnect hoses to the valve and secure in place with clamps FIG 16 2 EXPLODED VIEW Due to the internally rectified coil do attempt to test this type of coil with an ohm meter The reading will be open or ve
19. e 9 Control board 1 Brew volume NOTE Volume adjustments must made with sprayhead installed 2 Lime build up 3 Dispense Valve REMEDY Brewer has shut down due to mal function See Diagnostics Water lines and valves to the brewer must be open Check for voltage across the termi nals at the terminal block The indicator lamp must be lit Allow brewer to heat until ready or disable the brew lockout feature Water must be in contact with refill probe before brew cycle will start Check replace Check replace Check replace Inspect the dispense valve and sprayhead for excessive lime de posits Delime as required Remove dispense valve and clear any obstructions Rebuild or replace valve if necessary See page 24 Check replace 42461 081310 TROUBLESHOOTING cont BREWING CIRCUIT cont PROBLEM Dripping from sprayhead Weak beverage Dry coffee grounds remain in the funnel Low beverage serving tempera ture PROBABLE CAUSE 1 Lime build up 2 Dispense valve 1 Sprayhead 2 Water temperature 3 Filter type 4 Coffee grind 5 Funnel loading 1 Sprayhead 2 Funnel loading 1 Thermal server airpot not pre heated before brew cycle REMEDY Inspect the tank assembly for ex cessive lime deposits Delime as required Check replace Aclean sprayhead must be used for proper extraction Place an empty brew funnel on an empty decanter beneath the spray head
20. el 3 and re enter the serial number in level 4 4 42461 081310 TROUBLESHOOTING cont REFILL CIRCUIT PROBLEM Will not PROBABLE CAUSE 2 1 Power off to brewer 2 Water shut off 3 Error Message 4 0N OFF Switch equipped 5 Lime build up on Probe s 6 Refill Valve or Control Board REMEDY Press ENABLE BREW switch control panel to determine if power is ON Make sure water is ON Brewer has shut down due to mal function See Diagnostic Section in this manual Make sure ON OFF Switch is ON and indicator is lit Remove the Level Probe s and check for lime deposit on tip Clean and reinstall Check valve Refill does not shut off Power ON Refill does not shut off Power OFF 1 Lime build up on probe 2 Water Level Sensing System 3 Refill valve or control board 1 Refill valve Remove Level Probe and check for lime deposits on tip Clean and reinstall Replace control board Check valve Clean or replace valve as needed 42461 081310 TROUBLESHOOTING HEATING CIRCUIT PROBLEM Water does not heat to proper temperature IMPORTANT Make sure no tem perature tests are taken before the display reads ready Tank tem perature must be stabilized before readings are taken Spitting or excessive steaming cont Brewer is making unusual noises PROBABLE CAUSE 1 Display s error
21. he control board and membrane switch for proper operation Removal and Replacement 1 Disconnect the brewer from the power source 2 Disconnect wires from the valve 3 Drain enough water from the tank so the water level is below the outlet 4 Remove sprayhead and hose from the valve 5 Removethe nutsecuring the valve to the sprayhead panel 6 Install new valve using the nut from step 5 7 Reinstall sprayhead and hose to the valve and secure in place with clamps FIG 17 2 LATE MODEL BREW VALVE Due to the internally rectified coil do not attempt to test this type of coil with an ohmmeter The reading will be open or very high resistance depending on the polarity of your meter leads 42461 081310 REFILL VALVES FIG 17 1 REFILL VALVES Location The refill valve is located inside the front of the brewer Test Procedures 1 Enter programming level 2 scroll to Service Tools then scroll to Refill Valve 2 Briefly activate the refill valve in the test mode With a voltmeter check the voltage across the coil wires Theindication mustbe 120 volts ac fortwo wire 120 volt models and three wire 120 208 240 volt models or 230 volts ac for two wire 230 volt models If voltage is present proceed to 4 If voltage is not present refer to Wiring Dia grams and check main wiring harness If har ness checks ok replace control board 4 Checkthe refill valve for coil action Briefly activate t
22. he refill valve in the test mode and listen carefully near the refill valve for a clicking sound as the magnetic coil pulls the plunger in If the sound is heard as described and water will not pass through the refill valve there may be a blockage in the water line before the refill valve or the solenoid valve may require inspection for wear and removal of waterborne particles If the sound is not heard as described pro ceed to 5 5 Disconnectthe brewer fromthe power source 6 Check for resistance across the coil terminals 2000 2 depending on which coil is being checked 18 If resistance is not present as described replace the refill valve If resistance is present as described check for debris in the valve Removal and Replacement 1 Remove both wires from the refill valve 2 Verify that the white shutoff clamp between valve and tank is squeezed shut 3 Disconnect both water lines at the valve 4 Remove the two screws securing the valve to the component mounting bracket 5 Using the two screws install the new valve to the component mounting bracket 6 Securely fasten the water lines to the valve 7 Refer to wiring diagrams when reconnecting the wires 8 Installaccess panels and covers and refer to Initial Set up for refill and operation Disassembly Bunn does not offer repair rebuild kits for the refill valves but some disassembly may be accomplished on the early style valves in the event
23. isconnecting ribbon cable from control board Removal and Replacement 1 Disconnect the ribbon cable from the 22 pin con nector on the control board 2 Gently peel the membrane switch from the front face plate assembly 4 Remove any adhesive that remains on the front face plate 5 Remove the adhesive backing from the new mem brane switch Insert the ribbon cable through the slot in the front face plate and apply the membrane switch to the front face plate 6 Connectthe ribbon cableto the 22 pin connector on the control board making sure every pin on the control board is inserted into the ribbon cable connector a thin paper clip around each meter lead and extend past the tip by 1 4 1 2 You may need to sand off the clear coating on some clips FIG 15 2 MEMBRANE SWITCH CONTINUITY 15 42461 081310 BREW VALVE EARLY MODELS AND BYPASS VALVE ALL ICB s FIG 16 1 EARLY BREW VALVE Location The brew valve is located inside the top cover behind the front face plate Test Procedures 1 Refertothe Programing Section for Service Tools Test Outputs Brew Valve 2 Be sure brew funnel amp server are in place before activating valve 3 Check the valve for coil action Turn on the valve with the test mode Listen carefully in the vicinity of the brew valve for a Click as the coil pulls the plunger in no sound heard as described proceed to 4 If the soun
24. message 2 Water not touching main short level probe 3 Water Level Probe Sensing System 4 Temperature Probe 5 Limit Thermostat or TCO 6 Tank Heater 1 Lime build up on temperature probe tank or tank heater 2 Temperature Probe 3 Control Board 1 Plumbing lines 2 Water supply 3 Lime build up REMEDY Brewer has shut down due to mal function See Diagnostics Remove level probe and grommet Look into hole on tank lid Water must be within approximately one inch from top of tank Check refill circuit Heaters will not turn on if water is not grounding level probe Check replace Check replace Check replace Inspect probe and tank assembly for excessive lime deposits Delime as required Check replace Check replace Plumbing lines should not rest on the counter top The brewer must be connected to cold water supply Remove the tank lid and clean in side of tank with a deliming agent if necessary 42461 081310 TROUBLESHOOTING cont BREWING CIRCUIT PROBLEM Brew cycle will not start Consistently low beverage level in the dispenser or beverage overflows dispenser PROBABLE CAUSE 1 Display s error message 2 No water 3 No power or incorrect voltage to the brewer 4 ON OFF switch not in the position 5 Low water temperature Brew lockout is enabled 6 Water not touching refill probe inside tank 7 Membrane Switch 8 Dispense valv
25. nge Check 1 Temperature Sensor Probe Replace or repair as needed For Bad Connections open Temp Sensor Out Of Range Check 1 Temperature Sensor Probe Replace or repair as needed Wire For Shorts wire s shorted 9 42461 081310 COMPONENT ACCESS This section provides procedures for testing and replacing various major components used in this brewer should service become necessary Refer to Troubleshooting for assistance in determining the cause of any problem WARNING Inspection testing and repair of electri cal equipment should be performed only by qualified service personnel The brewer should be unplugged when servicing except when electrical tests are re quired and the test procedure specifically states to plug in the brewer WARNING Disconnect the brewer from the power source before the removal of any panel or the replace ment of any component All components are accessible by the removal of the top cover front access panel ICB or rear access panel ITCB amp ITB Refer to wiring diagrams at the back of this manual when reconnecting wires FIG 10 1 ICB ITCB HV COMPONENT ACCESS FIG 10 2 ITB ITCB COMPONENT ACCESS FIG 10 3 ICB ITCB HV TWIN COMPONENT ACCESS 42461 081310 CONTROL BOARD FIG 11 1 CONTROL BOARD Location The Control Board is located inside the top cover behind the front face plate Test Procedures The test procedures for the control board will vary depending
26. ogic Quality Beverage Equipment Worldwide Respect Earth Respect Earth with the stylized leaf and coffee cherry design Safety Fresh savemycoffee com Scale Pro Silver Series Single Smart Funnel Smart Hopper SmartWAVE Soft Heat SplashGard The Mark of Quality in Beverage Equipment Worldwide ThermoFresh Titan trifecta Velocity Brew A Partner You Can Count On Air Brew Air Infusion Beverage Bar Creator Beverage Profit Calculator Brew better not bitter BUNNSource Coffee At Its Best Cyclonic Heating System Daypart Digital Brewer Control Nothing Brews Like a BUNN Pouring Profits Signature Series Tea At Its Best The Horizontal Red Line Ultra are either trademarks or registered trademarks of Bunn O Matic Corporation 2 42461 030912 5 2 3 51001 10252 25 55 4 Diagnostic 9 10 BO ards 11 Membrane 12 13 IX 14 MM C M 15 C 17 18 Temperature
27. ontinuity across the limit thermostat terminals If continuity is presentas described the limitthermostat is operating properly If continuity is not present as described replace the limit thermostat Removal and Replacement 1 Remove the wires from limit thermostat termi nals 2 Carefully slide the limit thermostat out from under the retaining clip and remove limit thermostat 3 Carefully slide the new limit thermostat into the retaining clip Ensure the metal face has good contact with tank 21 FIG 21 2 LIMIT THERMOSTATS 42461 081310 TEMPERATURE PROBE FIG 22 1 TEMPERATURE PROBE Location The temperature probe is inserted through the tank lid assembly FIG 22 2 TEMPERATURE PROBE Test Procedures 1 Disconnect the brewer from the power source 2 WithaDC voltmeter check voltage across the two wires at J13 J3 on ITB on control board black probe to black wire red probe to white wire refer to FIG 19 2 Connect the brewer to the power source The indication should be between 4vdc cool to 1vdc at ready temperature 3 Disconnect the brewer from the power source II voltage is present as described circuit is working correctly voltage is not present as described proceed to 4 4 Disconnect temperature probe from J9 on control board Check the resistance across the two ter minals of the temperature probe The indication should be between 10 5 cool to 8700 at ready temperat
28. ry high resistance depending on the polarity of your meter leads 42461 081310 BREW VALVE LATE MODELS FIG 17 1 LATE MODEL BREW VALVE Location The brew valve is located inside the top cover behind the front face plate Test Procedures 1 Refertothe Programing Section for Service Tools Test Outputs Brew Valve 2 Be sure brew funnel amp server are in place before activating valve 3 Check the valve for coil action Turn on the valve with the test mode Listen carefully in the vicinity of the brew valve for a click as the coil pulls the plunger in If no sound is heard as described proceed to 4 II the sound is heard as described there may be a blockage in the valve hose tank or sprayhead Dis connect the brewer from the power source Remove the valve and inspect for blockage and de lime all related areas 4 Connect the voltmeter leads to the coil terminals Turn on the valve with the test mode The indication will be 2 3VAC off 120VAC on Set the meter to DC volts The indication should be 150 160VDC when off OV when on If the polarity of meter leads are reversed reading will indicate 150 160VDC Double these readings for 240 volt coils If voltage is present as described but no coil action is observed valve is defective Replace valve and test again to verify repair II voltage is not present as described refer to Wiring 17 Diagrams and check the brewer wiring harness Also check t
29. t its exclusive op tion while the equipment is under warranty shall either 1 provide at no charge replacement parts and or labor during the applicable parts and labor warranty periods specified above to repair the defective components provided that this repair is done by a BUNN Authorized Service Representative or 2 shall replace the equipment or refund the purchase price for the equipment THE BUYER S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS EQUIPMENT WHETHER DERIVED FROM WARRANTY OR OTHERWISE SHALL BE LIMITED AT BUNN S SOLE OPTION AS SPECIFIED HEREIN TO REPAIR REPLACEMENT OR REFUND In no event shall BUNN be liable for any other damage or loss including but not limited to lost profits lost sales loss of use of equipment claims of Buyer s customers cost of capital cost of down time cost of substitute equipment facilities or services or any other special incidental or consequential damages 392 AutoPOD AXIOM BrewLOGIC BrewMETER Brew Better Not Bitter BrewWISE BrewWIZARD BUNN Espress BUNN Family Gourmet BUNN Gourmet BUNN Pour O Matic BUNN BUNN with the stylized red line BUNNlink Bunn OMatic 0 BUNNserve BUNNSERVE with the stylized wrench design Cool Froth DBC Dr Brew stylized Dr design Dual Easy Pour EasyClear EasyGard FlavorGard Gourmet Ice Gourmet Juice High Intensity iMIX Infusion Series In tellisteam My Caf Phase Brew PowerL
30. they may need to be cleaned out Disassembly is not recommended on the newer style as damage to the valve could occur Refer to next page for exploded views 42461 081310 REFILL VALVES EARLY ICB CURRENT ICB amp amp ITB gt Flow control used on dual dilution STRAINER models only EARLY ITCB CURRENT ITCB amp ITB DD STRAINER 19 42461 081310 5 20 1 5 The tank heaters are located inside the tankand secured to the tank bottom Test Procedures 1 With a voltmeter check voltage across the white wire 120V Models or red wire 120 208 240V Models from the terminal block and black wire from the control board Connect brewer to the power source The indication must be 120 volts ac for two wire 120 volt models or 208 240 volts ac for three wire 120 208 240 volt models during a heating cycle 2 Disconnect the brewer from the power source II voltage is present as described proceed to 3 II voltage is not present as described refer to the Wir ing Diagrams and check wiring harness 3 Disconnect the wires from the tank heater termi nals 4 Checkresistance value across tank heater terminals and compare to chart If resistance is present as described reconnect the wires the tank heater is ok II resistance is not present as described replace the tank heater
31. ts and kinks in the tubing Make certain that all plumbing connections are sealed and electrical connections tight and isolated This brewer is heated at all times Keep away from combustibles WARNING Exercise extreme caution when servicing electrical equipment Unplug the brewer when servicing except when electrical tests are specified Follow recommended service procedures Replace all protective shields or safety notices Before troubleshooting this brewer check for the following Control Boards 1 Make sure ribbon cable is properly attached to the control board ALL PINS INSERTED INTO PLUG 2 Make sure there is a nylon insulating washer under each screw head that holds the control board to the plastic front end cap This is important for proper operation 3 Make sure before servicing brewer that voltage is present at control board 4 Press any warmer switch or observe if any indicator lights are glowing on the control panel If so proceed with testing If not check for voltage across pins 1 amp 2 of the ten pin J1 connector black and white wires voltage is present replace the control board If voltage is not present check wiring and voltage across terminal block black and white Correct the problem and retest before proceeding with testing NOTE n the event of board replacement technician will need to re program customer s settings and or recipes as well as re calibrate the temperature probe in program lev
32. ure FIG 22 3 TESTING TEMPERATURE PROBE If resistance is to specification replace the control Removal and Replacement board II resistance is not to specification replace the tem perature probe CONTINUED 22 42461 081310 Removal and Replacement 1 2 Disconnect the brewer from the power source Disconnect the two pin connector from J9 on control board 3 Pull temperature probe out of it s grommet 4 Install in reverse order Calibration 1 2 Remove silicon vent fitting from tank lid Insert a digital temp probe through the exposed vent hole in tank lid to the same depth as the fac tory temp probe FIG 20 1 FIG 23 1 CALIBRATE TEMP PROBE 23 Press and hold the Hidden button until display reads CAL TEMPERATURE SENSOR NO YES Select YES The display should show something similar to the screen below FIG 20 2 NOTE Variables such as tank set temperature could show different numbers than the example shown here Tank must be at it s ready temp before calibrating Press the Control button to increase Digi tal button to decrease temperature reading until it matches the reading on the thermometer Exit program mode remove thermometer and install vent fitting Calibration is complete Brewer num be FIG 23 2 CALIBRATION 42461 081310 VOLTAGE SELECTOR SWITCH Removal and Replacement
Download Pdf Manuals
Related Search