Honeywell 3355 Thermostat User Manual
Contents
1. 6 Step 3 Install Batteries 0 ocior riore rore inr nori peru annee Ri ndo oa cub 8 Step 4 Program 10 Personal Programming Chart 12 Step 5 Adjust Fan Operation Switch as Required 18 Step 6 Adjust System On Time F C as 18 Step 7 Mount Thermostat Mounting Plate nenna 21 Step 8 Wire Thermostat Terminals Step 9 Mount Ther O Sai a e rrr r aaraa aAa a aa a raae r Aaaa E E aA raa aA Pa aaea a aE Par Sha daaar nran Step 10 Check Thermostat Operation After Programming and Installing 28 Step 11 Set Fan and System Switches ee 30 Troubleshooting Guide eem curare cantine e eveieeouessebeessuetecevesbeccauediees 32 Limited One Year Warranty Inside Back Cover 3 69 1012 Step 1 Prepare for Installation 1 Check Table 1 to make sure this thermostat is compatible with your system If not return to the retailer For m2. 35 69 1012 TYPICAL ENERGY SAVINGS FOR REPRESENTATIVE CITIES IN THE U S AND CANADA Savings for Once A Day Savings for Twice A Day Savings for 5 F 3 10 F 5 C decrease 10 F 5 C decrease summer increase 30 28 2 26 8 24 22 8 5 20 2 18 16 9 5 14 1296 2 1096 4 8 o a 6 o lt 4 Minneapolis Edmonton Calgary Halifax Vancouver Buffalo Denver Boston Cincinnati NewYork Louisville San Dallas Los Angeles Diego St Paul Regina Moncton Cleveland Des Moines Chicago City Philadelphia Portland Francisco Atlanta Montreal Winnipeg Bay Milwaukee Omaha Detroit St Louis Seattle Wash DC Ottawa Quebec Salt Lake Pittsburgh Columbus Toronto St John s City Indianapolis Based on 10 F 5 C decrease 5 F 3 C decrease gives approximately 55 percent of these savings M2416A 36 69 1012 37 69 1012 38 69 1012 Limited One Year Warranty Honeywell warrants this product excluding battery to be free from defects in the workmanship or materials under normal use and service for a period of one 1 year from the date of purchase by the consumer If at any time during the warranty period the product i
3. D TURN OFF POWER to system at the furnace or at the fuse circuit breaker panel L Carefully unpack your new thermostat and mounting plate save package of screws instructions and receipt Remove the cover from the old thermostat If it does not snap off when pulled firmly from the bottom check for a screw used to lock on the cover L Loosen screws holding thermostat to subbase wallplate or wall and lift away Disconnect wires from the old thermostat or subbase As you disconnect each wire use masking tape to label it with the old terminal designation If there are only two wires they do not need to be labeled If there is an extra wire that is not connected to your old thermostat you will a so not be connecting it to your new thermostat Wrap wires as shown to keep them from falling back into the wall WIRES THROUGH WALL OPENING M5136 69 1012 Replacing a Clock Thermostat that has C or C1 Clock Terminals If you are replacing a Honeywell Chronotherm Thermostat you can find one or two wires that go to the C or C1 clock terminals on the Chronotherm Thermostat wiring wallplate Do not allow them to touch or you may damage your transformer Disconnect the wires and wrap them separately using electrical tape Do not wrap them together Place the wires where they do not interfere with the operation of the new thermostat Record the colors and terminal designation labels of the remaining wires
4. If you prefer to program the thermostat after it is installed on the wall skip to page 18 and return later to this programming section The following Personal Programming Chart pages 12 and 13 can be helpful for planning your program schedule of time and tempera ture settings for various times of the day Four time periods are available during week days WAKE LEAVE RETURN and SLEEP These periods can be seen individually on the display as you press the SET SCHEDULE key WAKE is the time period you want the house at a comfortable temperature when you get up and while you get ready for work or school When deciding what time to set for your WAKE period include extra lead time depending on the outside temperature and your furnace response time to give the furnace a head start to heat the house before you get up This will be a higher temperature during heating season or a lower temperature during cooling season LEAVE is the time period you can set for an energy saving temperature while you are away at work or school This will be a lower tem perature during heating season or a higher temperature during cooling season RETURN is the time period you want the house at a comfortable temperature for activities before bedtime When deciding what time to set for your RETURN period include extra lead time depending on the outside temperature and your furnace response time 69 1012 to give the furnace a head sta
5. do not operate the cooling system when outside temperature is below 50 F 10 C See compres sor manufacturer instructions for further information NOTE When cooling setting is changed thermostat may delay up to five minutes before turning on the air conditioner This delay protects the compressor Cool Off Heat LI LI LI Auto LI Warmer Cooler Cool Off Heat L Auto L 29 Move the system switch to COOL and the fan switch to AUTO Press key until setting is about 10 F 6 C below room tempera ture The cooling equipment and fan should start Press key until the setting is about 10 F 6 C above room tempera ture The cooling equipment and fan should stop Move the system switch to OFF with the fan switch at AUTO The system and fan should be off 69 1012 Step 11 Set Fan and System Switches Fi he f itch Lae FAN AUTO Normal setting for most homes A Aulo single speed fan turns on automatically with the air conditioner furnace A two speed fan usually runs on high with the air conditioner and on low with the furnace Exception If the fan operation switch on the back of the thermostat is set to the E position see page 20 the fan operates only with the furnace FAN ON The fan runs continuously Use for Auto improved air circulation during special occa a sions or for more efficient electronic air cleaning In a heat onl
6. Six or more wires If there are six or more wires excluding clock wires attached to terminals you probably have a variation of a heat pump or multistage system The thermostat is not compatible with such systems so return the product to the place of purchase If you would like information about which programmable thermostats work with your system call Honeywell Customer Assistance at 1 800 468 1502 Three thermostat wires If you have three wires for heating only and can operate the fan using the fan ON switch this thermostat works with your system However some hot water zoned heating systems have three thermostat wires The thermostat does not work without installing an isolating relay on these systems For details call Honeywell Customer Assistance at 1 800 468 1502 69 1012 Step 3 Install Batteries IMPORTANT Batteries must be installed for programming and operation of the thermostat and heating cooling system Purchase two AA alkaline batteries non alkaline batteries do not last as long and can leak causing damage to the thermostat or the wall surface We recommend Energizer batteries Make sure the thermostat is set to the OFF position 1 Use a coin to remove the battery door Install the fresh batteries as shown making sure positive and negative terminals are oriented correctly Replace the battery door REMOVING BATTERY M1719C DOOR As the batteries are running low a bAt Lo ind
7. gt 12 gt POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED HEATI RELAY OR VALVE COIL COOLING CONTACTOR COIL 1 12 M8792 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M8795 26 69 1012 Step 9 Mount Thermostat NOTE To remove the thermostat from the wall first pull out at the bottom of the thermostat then remove the top A ENGAGE TABS AT TOP OF B PRESS LOWER EDGE C SWING OPEN COVER THERMOSTAT AND MOUNTING PLATE OF CASE TO LATCH TO CHECK OPERATION 7 M1734A 27 69 1012 Step 10 Check Thermostat Operation after Programming and Installing Heating Do not check heating system operation by jumpering thermostat terminals at the primary control such as the gas valve zone valve or oil burner control This damages the thermostat instead jumper R and W wires at the thermostat Cool Off Heat a a Auto LI LI Warmer Cooler 28 Move the system switch to HEAT and the fan switch to AUTO Press key until the setting is about 10 F 6 C above room tempera ture Heating should start and the fan should run after a short delay immediately if fan operation switch is set in E position Press key until setting is about 10 F 6 C below room temperature The heating equipment should shut off 69 1012 Cooling To avoid possible compressor damage
8. CT OPERATION DESIRED HEATING SYSTEM FUEL SWITCH POSITION WARM AIR A IN B IN FURNACE F WATER A OUT B IN BOILER 1 TURN F ELECTRIC A IN B OUT FURNACE 1 TURN M8796 69 1012 Step 7 Mount Thermostat Mounting Plate Position the mounting plate on the wall Use a level to make sure the mounting plate is level Use a pencil to mark the two mounting holes Remove the mounting plate from the wall and drill 3 16 inch holes in the wall if drywall as marked For firmer material such as plaster or wood drill 7 32 inch holes Gently tap anchors provided into drilled holes until flush with the wall L Reposition mounting plate over the holes pulling wires through the wiring opening Loosely insert two mounting screws into the holes MOUNTING SCREWS 2 M1718 21 69 1012 Level for appearance only thermostat functions properly even when not level Tighten the mounting screws M1714A 22 69 1012 Step 8 Wire Thermostat Terminals NOTE All wiring must comply with local In 5 wire installations only be sure to codes and ordinances If unsure remove the factory installed jumper about household wiring procedures connecting terminals R and Rc call your local heating air conditioning contractor METHOD TO INCREASE WIRE LENGTH WIRE NUT SIZE ROR Refer to masking tape labels you placed on the DNO TENSE WIRES wires when you removed you
9. Honeywell MagicStat 3355 Programmable Thermostat by Honeywell OWNER S GUIDE Weekday Weekend 5 day 2 day Programmable Heat and or Cool Low Voltage 20 to 30 Vac Thermostat and Mounting Plate Model CT3355 p ee 69 1012 Welcome to the world of comfort and energy savings with your new Honeywell MagicStat Programmable Thermostat Your new thermostat will automatically control the temperature in your home keeping you comfortable while saving energy when pro grammed according to the instructions in this manual Direct any questions concerning the application of this thermostat to Honeywell Customer Assistance at 1 800 468 1502 Monday Friday 7 00 a m 5 30 p m Central time 7 RECYCLING THERMOSTAT If this thermostat is replacing a thermo stat that contains mercury in a sealed tube see Fig 1 do not place your old thermostat in the trash Contact your local waste management authority for instructions regarding recycling and the proper disposal of your old thermostat If you have questions call Honeywell Inc at 1 800 468 1502 Fig 1 Typical location of a mercury switch in a thermostat M3701 69 1012 Table of Contents Step 1 Prepare For Installation ee 4 Step 2 Remove Old
10. LY CHANGE or HOLD pressing this cancels your change 16 69 1012 Weekda Weekend 7 Check Programs press repeatedly to view each time and temperature then Run press Weekda Weekend Cancel program press WAWA until program to cancel shows then press Check Usage Press for length of time heat or air conditioning has been running today since midnight press again for yesterday s usage press again for cumulative Run press to clear cumulative reading if desired then press Permanently Change a program Repeat steps in Heating Program section or Cooling Program section pages 14 through 16 as applicable Run Return to normal program or start program press Questions Call Honeywell Customer Assistance 1 800 468 1502 17 69 1012 Step 5 Adjust Fan Operation Switch as Required The thermostat fan operation switch labeled FUEL SWITCH see illustration on page 20 is factory set in the F position This is the correct setting for most systems If your system is an electric heat system set the switch to E The E setting allows the fan to turn on immediately with the heating or cooling in a system where the G terminal is connected Step 6 Adjust System On Time F C as Required C The system on time is factory set for a warm air gas or oil heating system If you are installing it on another type of system adjust the on time accordingly b
11. OF ANY IMPLIED WARRANTIES INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IS HEREBY LIMITED TO THE ONE YEAR DURATION OF THIS WARRANTY Some states do not allow limitations on how long an implied warranty lasts so the above limitation may not apply to you This warranty gives you specific legal rights and you may have other rights which vary from state to state If you have any questions concerning this warranty please write our Customer Assistance Center Honeywell Inc Box 524 Minneapolis MN 55440 0524 or call 1 800 468 1502 Monday Friday 7 00 a m to 5 30 p m Central time In Canada write Retail Products ON30 Honeywell Limited Honeywell Limit e 155 Gordon Baker Road North York Ontario M2H 2C9 39 69 1012 Honeywell Home and Building Control Home and Building Control Helping You Control Your World Honeywell Inc Honeywell Limited Honeywell Limit e Honeywell Plaza 155 Gordon Baker Road P O Box 524 North York Ontario Minneapolis MN 55408 0524 M2H 2C9 69 1012 6 96 J S Printed in U S A Printed on recycled paper containing at Copyright 1996 Honeywell Inc All Rights Reserved U S Registered Trademark least 10 post consumer paper fibers
12. ere you left off 69 1012 Personal Programming Chart Heating Program Weekdays Start Time Heating Temperature WAKE LEAVE RETURN SLEEP Weekends WAKE SLEEP AN WAKE and RETURN start times should include extra lead time based on outside temperature and furnace response time to give your furnace a head start to heat the house A The temperatures cannot be set any higher than 88 F 31 C or any lower than 45 F 7 C 12 69 1012 Cooling Program Weekdays Start Time Heating Temperature WAKE LEAVE RETURN N SLEEP Weekends WAKE SLEEP N WAKE and RETURN start times should include extra lead time based on outside temperature and furnace response time to give your furnace a head start to heat the house A The temperatures cannot be set any higher than 88 F 31 C or any lower than 45 F 7 C NOTE f you decide not to program the thermostat it automatically controls heating at 68 F 20 C and cooling at 78 F 26 C 24 hours a day 13 69 1012 This guide can be used for programming your new thermostat NOTE Batteries are required for operation and programming When inserting batteries set system switch to OFF Remove the battery door on the thermostat left side using a coin at the bottom Follow instructions on pages 8 and 9 Time Set Current Time Day Ahead To set the time press and release FEM once then
13. icator flashes for one or two months before batteries run out completely Replace the batteries as soon as possible after the indicator starts flashing If you do not replace the batteries sometime while bAt Lo is flashing the 69 1012 indicator eventually stops flashing bAt Lo stays on without flashing indicating the thermostat and heating cooling system have stopped working when the batteries are almost completely dead After the batteries are completely dead the bAt Lo indicator disappears leaving a com pletely blank display INSTALL TWO AA ALKALINE BATTERIES AS SHOWN M1713 Press down on the left ends of the batteries to remove If you insert the new batteries within 20 to 30 seconds of removing the old ones you do not have to reprogram the thermostat However if the display is blank the batteries are dead or incorrectly installed and you must reprogram See pages 14 and 15 to reprogram IMPORTANT Although the thermostat has a low battery indicator replace the batteries once a year to prevent the thermostat and heating cooling system from shutting down due to lack of battery power As a precaution when leaving home for longer than a month change batteries before you leave to prevent the system from shutting down due to lack of battery power 69 1012 Step 4 Program Thermostat After the batteries are installed the thermostat can be easily programmed in your hand before it is installed on the wall
14. ore information call Honeywell Customer Assistance toll free 1 800 468 1502 Table 1 Compatibility Chart Gas Standing Pilot Gas Electronic Ignition Gas Fired Boilers Gas Millivolt Oil Fired Boilers Oil Fired Furnace Electric Furnace Electric Air Conditioning Baseboard Electric 120 240 Line Volt Heat Pumps Multistage Equipment Not compatible with any 120 240 volt circuit Compatible with 2 wire Honeywell Zone Valves Isolating relay required for 3 wire thermostats for zone valves Not compatible with 2 wire White Rodgers no 1361 Valves b Compatible with hot water baseboard systems Will not work efficiently on steam or gravity systems 4 69 1012 1 Acquire tools and items below as needed Also purchase two AA alkaline batteries we recom mend Energizer batteries CROSS RECESSED SCREWDRIVER HAND OR POWER DRILL WITH 3 16 INCH DRILL BIT IF NEEDED TO DRILL HOLES IN WALL WIRE CUTTER STRIPPER OR SHARP MASKING TAPE IF NEEDED TO LABEL WIRES KNIFE IF NEEDED TO STRIP WIRES AS DISCONNECTED FROM OLD THERMOSTAT LEVEL IF NEEDED TO LEVEL num THERMOSTAT FOR APPEARANCE 5 69 1012 alp 2 Remove Old Thermostat Test to make certain that your heating and cooling systems are working properly either does not work contact your local heating air conditioning dealer To avoid compressor damage do not operate the cooling system when outdoor temperature is below 50 F 10 C
15. ot come Continued Cooling will not come on Jumper wires R and W If heat does not come on contact your heating dealer If display is blank or shows bAt Lo install fresh batteries If temperature setting is higher than current temperature and the display shows HEAT contact Honeywell Customer Assistance at 1 800 468 1502 Check that the switch on the thermostat is set to COOL Check the system fuse or circuit breaker and replace or reset if necessary Check for correct wiring and good connections Jumper wires Rc and Y If cooling does not come on contact your cooling dealer If display is blank or shows Lo install fresh batteries The thermostat has a built in time delay on cooling Allow five to ten minutes after changing the setting before the air conditioner starts Make sure the outdoor disconnect is energized on 33 69 1012 Cooling will not come Continued The house is too warm or too cool SYSTEM ON indicator is lit but no heat is coming from the registers If temperature setting is lower than the current temperature and the display shows COOL move the system switch from COOL to OFF for ten minutes After ten minutes return the switch to the COOL position If the air conditioner comes on compressor may have reached its high limit temperature protection and shut down If the air conditioner does not come on after the ten minutes and the display shows COOL contact Honeywell Customer A
16. press until current time shows to set the day Time Set in th til t day shows then pr Pup press and release YII again then press until current day shows then press Heating Program With system switch at HEAT press and release once WAKE Mon Fri and SET appear on the display 14 69 1012 Time Warmer Temp Press to program WAKE time and press Ea Mon Fri Repeat sequence for LEAVE RETURN and SLEEP Time Ahead to program WAKE temperature for Press until SAT SUN WAKE and SET appear on the display Press to program Back Temp WAKE time and to program WAKE temperature for Sat Sun Repeat sequence for SLEEP Cooling Program With system switch at COOL follow the same instructions as for the Heating Program After programming adjust the fan and system switches as desired Press and release to start the program 15 69 1012 A quick guide for operating or making changes follows NOTE System switch must be set to Heat or Cool to perform the following Temp Temporarily Change temperature for current period only press TEMPORARY indicator Cooler Run shows on display canceling itself at the next scheduled change or to cancel sooner press 2 Temp Hold Hold a temperature indefinitely such as when on vacation press Temp then press A Ri HOLD appears on the display to cancel press Check Current Temperature Setting press EJ When using TEMPORARI
17. r old thermostat Match the letter of your old thermostat wire WIRE 6 IN 152 MM T FROM OF 18 GAUGE with the terminal of the corresponding letter WALL THERMOSTAT on the back of your new thermostat Refer ANA to illustrations on pages 25 and 26 Hold the CoL ORS thermostat as shown to minimize need for WIRE ENDS M1715A wire extenders If wires are still too short use wire connectors purchased locally to extend wires See illustration for guidelines on using wire extenders 23 69 1012 1 Loosen the terminal screws and slip each wire beneath its matching terminal See illustration lower right for wire insertion technique Securely tighten the terminals Plug the hole in the wall with insulation to help prevent drafts from adversely affecting the thermostat operation JUMPER FACTORY INSERT INSTALLED REMOVE za IF 5 WIRE SYSTEM 5 16 in STRAIGHT 8 mm UNDER ae SCREW HEAD 4 END OF WIRE VISIBLE HERE M3002A M1712A 24 69 1012 2 WIRE HEAT ONLY JUMPER INTACT POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED JUMPER M8793 4 WIRE HEAT COOL JUMPER INTACT COOLING CONTACTOR COIL JUMPER POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED 25 M8794 69 1012 5 WIRE HEAT COOL JUMPER REMOVED 3 WIRE COOL ONLY JUMPER INTACT JUMPER COOLING CONTACTOR COIL EA EA
18. rt to heat the house before you arrive home Again this is higher heating or lower for cooling SLEEP is the time period you can set for an energy saving temperature while you are sleeping Again this is lower for heating or higher for cooling For more comfortable sleeping some people choose not to raise the cool temperature during the night You will set one schedule for weekdays and another for weekends because your require ments will probably be different for each Also during weekends only the WAKE and SLEEP time periods are available Fill in the times and temperatures you desire for weekdays and weekends If you decide not to program the thermostat it will automatically control heating at 68 F 20 C and cooling at 78 F 26 C 24 hours a day Also you do not 11 need to enter a time and temperature program for all periods if your schedule does not require it For example a house that is occupied during weekdays would only require programs for WAKE and SLEEP If no program is entered for the weekends the thermostat will operate on the weekday SLEEP program all weekend Before programming remove the clear plastic overlay covering the display When pressing the keys use the ball of your finger or a soft pencil eraser Using sharp fingernails or pencil points can damage the keypad If you make an error at any time during programming just press the RUN PROGRAM key and continue again at the step wh
19. s defective or malfunctions Honeywell shall repair or replace it at Honeywell s option within a reasonable period of time If the product is defective i return it with a bill of sale or other dated proof of purchase to the retailer from which you purchased it or ii package it carefully along with proof of purchase including date of purchase and a short description of the malfunction and mail it postage prepaid to the following address Honeywell Inc in Canada Honeywell Limited Honeywell Limit e Return Goods Department Product Services ON30 1050 Berkshire Lane 155 Gordon Baker Road Plymouth MN 55441 4437 North York Ontario M2H 2C9 This warranty does not cover removal or reinstallation costs This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer Honeywell s sole responsibility shall be to repair or replace the product within the terms stated above HONEYWELL SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE OF ANY KIND INCLUDING ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING DIRECTLY OR INDIRECTLY FROM ANY BREACH OF ANY WARRANTY EXPRESS OR IMPLIED OR ANY OTHER FAILURE OF THIS PRODUCT Some states do not allow the exclusion or limitation of incidental or consequential damages so this limitation may not apply to you THIS WARRANTY IS THE ONLY EXPRESS WARRANTY HONEYWELL MAKES ON THIS PRODUCT THE DURATION
20. ssistance at 1 800 468 1502 If 2 or 4 wire installation verify R Rc jumper is installed Press PRESENT SETTING key to check the current temperature setting If desired change the temperature setting See page 16 Allow time for the furnace to heat up and the fan to come on before checking for heat at the register Check to make sure system on time is set correctly according to page 18 and 19 34 69 1012 The furnace cycles too frequently or the system cycle length is too short or too long The thermostat s current setting does not match the display temperature to within 1 Incorrect room temperature showing on thermostat display bAt Lo remains on display after fresh batteries are installed Readjust system on time according to instructions on pages 18 and 19 Check that the wiring hole in the wall behind the wallplate was plugged with insulation to prevent drafts that might adversely affect the thermostat operation Be aware that it is normal for the current setting and display temperature to differ on occasion During recovery from setback or setup setting and display temperatures may differ for up to 30 minutes after recovery period Make sure the hole behind the thermostat is plugged with insulation to help prevent drafts from adversely affecting the thermostat operation The thermostat is factory calibrated and cannot be adjusted Remove the batteries Wait one hour Install fresh alkaline batteries
21. y setting screws A and B on the back of the thermostat Use the heating system table shown in the illustration page 20 as a guide Optimize the system on time according to the type of system to minimize room temperature swings Setting the screw out one turn means turning the screw approximately 360 counterclockwise or about one complete turn In the unlikely event that you want a longer System on time readjust screws A and or B as follows 69 1012 First turn in both screws completely then adjust for system type Warm Air Furnace Set at the Hot Water setting A out one turn B leave in Electric Furnace Leave at the Warm Air Furnace setting A leave in B leave in NOTE This thermostat does not have a setting for steam gravity air Cycles would not be long enough for accu rate temperature control IMPORTANT When using a high efficiency furnace such as a 9090 or greater AFUE Average Fuel Utilization Efficiency unit adjust screw A out one turn and leave screw B in The thermostat is set to read the tempera ture in degrees Fahrenheit If readings are desired in degrees Celsius adjust screw C out one turn as shown in illustration 19 69 1012 THERMOSTAT BACK DISPLAY F DISPLAY C FOR HIGH EFFICIENCY FURNACE 90 AFUE ADJUST SCREW A OUT ONE TURN SCREW B IN FUEL SWITCH POSITION FUE L SWITCH 20 ADJUST SCREWS THROUGH HOLES TO SELE
22. y system fan runs continuously only if the fan relay is connected to the thermostat 30 69 1012 Then set the system switch COOL The thermostat controls your air conditioning system OFF Both the heating and air conditioning systems are off HEAT The thermostat controls your heating system 31 Cool Off LI Cool Off LI LI Cool LI LI Heat Heat LI Heat LI 69 1012 Troubleshooting Guide Display will not come on Temperature display will not go lower than 45 F 7 C or higher than 88 F 31 C during programming Temperature change occurs at the wrong times Heating will not come on Then Set the system switch to OFF Remove batteries Insert backward for at least five seconds to reset thermostat Replace batteries correctly Display should come on Make sure batteries are fresh and installed correctly Gently clean battery contacts using a soft pencil eraser Do not use anything abrasive on the clips You have reached the temperature setting limit The setting range is 45 F to 88 F 7 C to 31 C Check the program times for the period in question Be sure that AM and PM indications are correct Make sure the current day and time are correct Reprogram if necessary Check that the switch on the thermostat is set to HEAT Check the system fuse or circuit breaker and replace or reset if necessary Check for correct wiring and good connections 32 69 1012 Heating will n
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