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Installation and Maintenance

Service Manual

Analysis or processing of some of the malfunction display:

1. Compressor discharge protection

Possible causes: shortage of refrigerant; blockage of air filter; poor ventilation or air flow short pass for condenser; the system has

noncondensing gas (such as air, water etc.); blockage of capillary assy (including lter); leakage inside four-way valve causes incorrect

operation; malfunction of compressor; malfunction of protection relay; malfunction of discharge sensor; outdoor temperature too high.

Processing method: refer to the malfunction analysis in the above section.

2. Low voltage overcurrent protection

Possi ble cause: Sudden drop of supply voltage.

3. Communication malfunction

Processing method: Check if communication signal cable is connected reliably.

4. Sensor open or short circuit

Processing method: Check whether sensor is normal, connected with the corre sponding position on the controller and if damage of lead

wire is found.

5. Compressor over load protection

Possible causes: insufcient or too much refrigrant; blockage of capillary and increase of suction temp.; improper running of compressor,

burning in or stuck of bearing, damage of discharge valve; malfunction of protector.

Processing method: adjust refrigerant amount; replace the capillary; replace the compressor; use universal meter to check if the

contactor of compress or is ne when it is not overheated, if not replace the protector.

6. System malfunction

i.e.overload protection.When tube temperature(Check the temperature of outdoor heat exchanger when cooling and check the

temperatur e of indoor heat exchanger when heating) is too high, protectionwill beactivated.

Possi ble causes: Outdoor temperature is too high when cooling; insufcient outdoor air circulation; refrigerant ow malfunction.

please refer to the malfunction analysis in the previous section for handling method .

7. IPM module protection

Processing method:Once the module malfunction happens,if it persists for a long time and can not be selfcanceled, cut off the power and

turn off the unit,and then re-energize the unit again after about 10 min.After repeating the procedure for sever times, if the malfunction

still exists,replace the module.

Gree GWH12QB-K6DNB8I User Manual

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