PART 7 TROUBLESHOOTING
Contents
1. Current protection No 2 fixed compressor 14 16HP outdoor units display 333 XRV Systems 2 2 1 THE AIR CONDITIONER DOES NOT RUN AFTER PRESSING ON OFF BUTTON 2 2 1 1 Communication malfunction between outdoor units Display The outdoor unit digital diode is displaying E0 Solutions Check if communication cable is broken off Q Exchange H1 H2 line if there is no broken circuit 2 2 1 2 Phase sequence error Display The outdoor unit digital diode is displaying E1 Solutions Check if the voltage between the power line terminals A B C of outdoor units and N is normally 220v If not please check whether the power lines are well connected After checking the voltage without finding any error please transpose any two of the outdoor units power lines A B C 2 2 1 3 Communication trouble between indoor unit and outdoor unit Display Outdoor unit digital diode is displaying E2 and the timer lamp on the display board of the indoor unit which has the communication trouble blinks Solutions D Check if communication cable is broken off Exchange P Q line if there is no broken circuit 2 2 1 4 Outdoor unit ambient temperature sensor abnormal Display Outdoor unit digital diode is displaying E4 Solutions D Measure T4 electric resistance respectively and replace the broken one if the electric resistance is not correct Ifthe electric resistance is normal please test the outdoor PCB and change a new one if2. Display H3 is displayed on the outdoor unit diode Check the power supply of outdoor unit and communication wire between outdoor units 337
3. otherwise the module must be changed 2 2 2 7 Current protection of Fix1 compressor 335 XRV Systems Display P7 is displayed on the outdoor unit diode Solutions Check if constant compressor 1 is damaged or blocked 2 2 2 8 Current protection of Fix2 compressor Display P8 is displayed on the outdoor unit diode Solutions Check if constant compressor2 is damaged or blocked 2 2 3 COOLING OR HEATING CAPACITY IS NOT ENOUGH 2 2 3 1 Address setting for the indoor units is wrong Solutions Do spot check of the indoor unit address and reset for those repeated ones 2 2 3 2 Capacity code setting for the indoor units is wrong Solutions Do spot check of the indoor unit capacity code and reset for those repeated ones 2 2 3 3 Overcharge or lack of refrigerant 2 2 3 4 The system air leakage or alcidine leakage 2 2 3 5 4 way valve leakage blockade Solutions Replace with a new 4 way valve 2 2 3 6 Compressor leakage wear and tear Solutions Replace with a new compressor 2 2 3 7 Outdoor units are overload because there are many indoor units in the combination If all the indoor units are in operation cooling heating effect will be lowered Solutions Avoid all the indoor units running simultaneously Reduce the indoor units that connected in the system 2 2 4 THE WHOLE SYSTEM MAY RUN WELL WHILE A SPECIFIC INDOOR UNIT DOES NOT OPERATE QUITE WELL 2 2 4 1 Mode conflict Indoor Defrost lamp link If within one system some indoor
4. 2 2 Outdoor unit s LED indication XRV Systems No Display Malfunction or Protection Remark 1 EO Communication error between outdoor units Only slave unit display 2 E1 Phase protection All the outdoor units display 3 E2 Communication error between indoor unit and master unit All the outdoor units display 4 E4 Outdoor temperature sensor error All the outdoor units display 5 E8 Outdoor unit address error All the outdoor units display 6 E9 Power volt Error All the outdoor units display 7 HO Communication malfunction between DSP and 780034 All the outdoor units display 8 H1 Communication malfunction between 9177 and 780034 All the outdoor units display 9 H2 Quantity of outdoor unit decreases Only master unit display 10 H3 Quantity of outdoor unit increases Only master unit display 11 PO Inverter compressor top temperature protection All the outdoor units display 12 P1 Hi pressure protection All the outdoor units display 13 P2 Low pressure protection All the outdoor units display 14 P3 Compressor current Protection All the outdoor units display 15 P4 Compressor discharge temperature protection All the outdoor units display 16 P5 Outdoor condenser high temperature protection All the outdoor units display 17 P6 Inverter module protection All the outdoor units display 18 P7 Current protection No 1 fixed compressor All the outdoor units display 332 XRV Systems 19 P8
5. XRV Systems PART 7 TROUBLESHOOTING 1 PIPING DIAGRAM Take HCSU 4001 XRV for example SV3 R Ny D ave SV1 ST2 OO 159 ae EXV N YYY EXV p 28 6 SZ T aE 6 4 5 af SV2 S aon i 19 1 i 7 T N w SV4 R 324 XRV Systems Remark 1 DC Inverter compressor 2 3 Fixed compressor 4 Gas liquid separator 5 Oil separator Note Mo del HCSU 2501 XRV HCSU 3001 XRV HCSU 3501 XRV has only one fixed compressor model HCSU 4001 XRV HCSU 4501 XRV have two fixed compressors EXV electromagnetic expand valve control 5 6 Every outdoor unit has two same EXV Max Open degree is 480 pulses Generally when system is electrified the EXV closes 700pulse first then opens to 350 pulse and stand by Then the unit is started it opens to the right pulse When the running outdoor unit receives OFF signal the EXV of auxiliary unit will stop while main unit is running and auxiliary unit is stopped at the same time If all outdoor units are stopped the EXV will close first then open to the pulse of stand by SV1 Opens when outdoor unit starts Closes when unit stops SV2 for spraying a little refrigerant to cool compressor down Open
6. eld Indoor outdoor unit communication is abnormal cable or whether the shield cable is earthina Yes Judge 2 Check whether the signal wiring between the indoor and outdoor units is wrong polarity No Judge 2 Check whether the signal wiring between the indoor and outdoor units is broken No Replace PCB Yes Yes Adopt the shield cable shield cable earthing Connect the signal wiring correctly Replace the broken wiring 329 XRV Systems Operation lamp flashes All the indoor alarm lamps flash at 0 5Hz Condenser sensor check point is abnormal or outdoor temp sensor is abnormal Judge 1 Check condenser temperature sensor is break off Connect it well Judge 2 Condenser temperature sensor is abnormal Validate Check whether the resistance of the evaporate Replace temperature sensor temperature sensor is correct according to Annex 1 Yes Yes Connect it well Judge 3 Check outdoor temperature sensor is break off Judge 4 Outdoor temperature sensor is abnormal Validate Check whether the resistance of the outdoor Replace temperature sensor temperature sensor is correct according to Annex 1 Replace the indoor PCB 330 XRV Systems Operation lamp flashes Defrost lamp flashes at 2 5Hz Mode conflict Check whether all the indoor units are in cooling or heating mode simultaneous or turn off the unit 331
7. erant out re vacuumize the system and then replenish the refrigerant if air is penetrating into the system c Improve the ventilation and heat emission environment for the outdoor unit 2 2 2 3 Low pressure protection Display The outdoor unit digital diode is displaying P2 Solutions Check if the low pressure protection switch is broken or loosen Test if the pressure low pressure is too low The probable reasons are the overcharge of refrigerant or system blockade 2 2 2 4 Over current protection Display The outdoor unit diode Is displaying P3 Solutions D Check if the current is overloaded The possible reasons for the over current are the overcharge of refrigerant air leakage bad ventilation and heat emission conditions 2 2 2 5 Compressor discharge temperature protection Condenser high temperature protection Display P4 P5 is displayed on the outdoor unit diode Solutions D Test digital discharge temperature outdoor condenser T3 temperature Test system pressure 8 High digital discharge temperature is likely owing to the lack of refrigerant air leakage or system blockade Check the above items respectively to solve the problem Condenser high temperature protection owes to the overcharge of refrigerant air leakage or bad ventilation and heat emission conditions 2 2 2 6 Module protection Display P6 is displayed on the outdoor unit diode Solutions guarantee the compressor and system is normal
8. i restores automatically sensor is abnormal 2 5Hz _ The timer lamp i Indoor outdoor unit After the malfunctions disappear it 2 Malfunction flashes at communication is abnormal restores automatically 2 5Hz Condenser sensor check point All the indoor i i After the malfunctions disappear it 3 Malfunction is abnormal or outdoor temp alarm lamps i restores automatically sensor is abnormal flash at 0 5Hz Defrost lamp When the indoor unit turns to heating 4 Alarm Mode conflict flashes at mode or is turned off the alarm will 2 5Hz disappear 327 XRV Systems Operation lamp flashes Run lamp flashes at 2 5Hz The evaporator sensor check point is abnormal or room temp sensor is abnormal Judge 1 Check evaporate temperature sensor is break off Connect it well Judge 2 Evaporate temperature sensor is abnormal Validate Check whether the resistance of the evaporate Replace temperature sensor temperature sensor is correct according to Annex 1 Yes Yes Connect it well Judge 3 Check room temperature sensor is break off Judge 4 Room temperature sensor is abnormal Validate Check whether the resistance of the room Replace temperature sensor temperature sensor is correct according to Annex 1 Replace the indoor PCB 328 XRV Systems Operation lamp flashes The timer lamp flashes at 2 5Hz Judge 1 Check whether the signal wiring is shi
9. it does not work well 2 2 1 5 The address of outdoor unit malfunction Display Outdoor unit digital diode display E8 Method Check the address code of outdoor unit PCB and make sure the address code in the right position 2 2 1 6 Voltage malfunction Display Outdoor unit digital diode is displaying E9 Method Check the voltage of outdoor if it is between 352V and 418V if not please use a manostat 2 2 2 AFTER RUNNING A WHILE THE SYSTEM STOPS TO PERFORM PROTECTION 2 2 2 1 Water level alarming trouble Display Indoor unit alarm lamp blinks Solutions Check if water pump runs well Check if the drainpipe is broken 334 XRV Systems Check if the water level switch is blocked If the above situations do not occur please change a new indoor PCB 2 2 2 2 High pressure protection Display The outdoor unit digital diode is displaying P1 Solutions Check if the high pressure protection switch is broken or loosen Test if the discharge temperature of the compressor is too high If the discharge temperature is too high and the current is lower than the rated current the system is probably lack of refrigerant and replenishes it Test if the pressure high pressure is too high or the current is overloaded If so the possible causes are the overcharge of refrigerant the system air leakage or bad ventilation conditions a Let the surplus refrigerant out if refrigerant is too much b Let the entire refrig
10. s if any compressor discharge temp is higher than 100 C 7 SV3 for changing the heat exchanged areas on heating mode Opens when the average temp of all indoor evaporators is less than 46 C Closes while the average temp of all indoor evaporators more than 52 C OFF on cooling mode SV4 oil returning valve Opens when the unit is running for every 20 minutes and last 3 minutes 325 XRV Systems 9 SV5 for defrost In defrosting mode the opening of SV5 can cut the refrigerant flowing circle so the defrosting process will takes less time 10 SV6 for by pass Closes when the unit stands by and system in heating mode Opens when the discharge temperature is too high in cooling mode Four way valve control 1 ST1 Main 4 way valve Closes in cooling mode and opens in heating mode 2 ST2 Auxiliary 4 way valve for changing the heat exchanger areas in cooling mode Opens when in part load mode and closes while in full load mode Closes in heating mode 326 XRV Systems 2 TROUBLESHOOTING 2 1 Indoor Units lamp flashes Infrared signal receiver Temporary button Operation lamp Timer indicator Alarm indicator PRE DEF indicator cooling and heating type or fan only indicator cooling only type LED Lamp No Type Contents Remarks flash The evaporator sensor check Run lamp nr After the malfunctions disappear it 1 Malfunction point is abnormal or room temp flashes at i
11. units are in cooling mode while some others are in heating mode mode conflict will be displayed on those cooling units LED and as a result those units will be power off 2 2 4 2 Indoor sensor electric resistance changing When the indoor sensor electric resistance changes to a certain extent under the control of the PCB the indoor unit will stop running at the set temperature Consequently the cooling effect is weakened 2 2 4 3 Electric throttle kit blockade Solutions Use new electric throttle kits 2 2 4 4 EXV trouble of the power off units 336 XRV Systems If the refrigerant is leaked owing to EXV trouble of the power off units the refrigerant will run through that power off units As a result the cooling heating capacity of the operating units is lowered Solutions Replace all the bad electric throttle kits 2 2 5 COMMUNICATION MALFUNCTION 2 5 1 Communication malfunction of DSP and 780034 Display HO is displayed on the outdoor unit diode Solutions change outdoor main control board 2 2 5 2 Communication malfunction of 9177 and 780034 Display H1 is displayed on the outdoor unit diode Solutions change outdoor main control board 2 2 5 3 Malfunction that the quantity of outdoor unit is less than actual quantity Display H2 is displayed on the outdoor unit diode Check the power supply of outdoor unit and communication wire between outdoor units 2 2 5 4 Malfunction that the quantity of outdoor unit is more than actual quantity
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