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Analysis or processing of some of the malfunction display:
1. Compressor discharge protection
Possible reasons: shortage of refrigerant; blockage of air filter; poor ventilation or air flow short pass for con-
denser;the system has non-condensing gas (such as air, water etc.); blockage of capillary assy (including filter);
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 malfunc-
tion analysis in the above section.
2. Low voltage overcurrent protection
Possible reason: 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 for normal condition of sensor, connected with the corresponding position on the
controller and if damage of
lead wire is found.
5. Compressor over load protection
Possible reasons: insufficient or too much refrigerant; blockage of capillary and increase of suction temp.;
improper running of compressor, burning in or stuck of bearing, damage of discharge valve; malfunction of pro-
tector. Processing method: adjust refrigerant amount; replace the capillary; replace the compressor; use universal
meter to check if the contactor of compress or is fine when it is not over heated, if not replace the protector.
6. System malfunction
Overload protection. When tube temperature(Check the temperature of outdoor heat exchanger when
cooling and check the temperature of indoor heat exchanger when heating) is too high, protection will
be activated. Possible reasons: Outdoor temperature is too high when cooling; insufficient outdoor
air circulation; refrigerant flow 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
self-canceled, 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.
Fault Displays
Models GWH30LB-D3DNA3E & GWH24LB-D3DNA3E
