Part 5 – Diagnosis and Troubleshooting
Ambient temp. sensor (T4) out of operation range
High temperature protection of inverter module
Water flow malfunction(after 3 times E8)
Communication malfunction between controller and main control board
Air side heat exchanger temperature sensor (T3)malfunction
The ambient temperature sensor (T4)malfunction
Suction temperature sensor(Th) malfunction
Discharge temperature sensor(Tp) malfunction
Inlet water temperature sensor (TW-in) malfunction
DC bus low voltage protection
Communication malfunction between main control board and inverter board
Liquid refrigerant temperature sensor(T2) malfunction
Gas refrigerant temperature sensor(T2B) malfunction
Three times L0 protection
HP pressure sensor malfunction
Outlet water temperature sensor (TW-out) malfunction
Three times PP protection and TW-out below 7 ℃
Inverter module board EE prom malfunction
Low pressure protection in cooling mode
Low pressure switch protection
High pressure switch protection
Compressor overcurrent protection
Comp discharge temp. too high protection
|TW-out-TW-in| value too big protection
|TW-out-TW-in| abnormal protection
High temperature protection of air side heat exchanger temperature(T3)
Inverter or compressor protection
DC bus low voltage protection
DC bus high voltage protection
Current sampling error of PFC circuit
Rotating stall protection
Phase loss protection of compressor
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