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High-pressure Side is Too Low and Low-pressure Side is Too High. NCHA0151S03 Gauge indication Refrigerant cycle Probable cause Corrective action High-pressure side is too low and AC356A High and low-pressure sides Compressor pressure opera- " Damaged inside compressor Replace compressor. No temperature difference Compressor pressure opera- " Damaged inside compressor Replace compressor. Both High- and Low-pressure Sides are Too Low. NCHA0151S04 Gauge indication Refrigerant cycle Probable cause Corrective action Both high- and low-pressure sides AC353A I There is a big temperature I Liquid tank inlet and Liquid tank inside is slightly I Replace liquid tank. I Check lubricant for con- I Temperature of expansion I Expansion valve inlet may I Temperature difference High-pressure pipe located I Check and repair malfunc- I Check lubricant for con- I Expansion valve and liquid Low refrigerant charge " Leaking fittings or compo- Check refrigerant for leaks. There is a big temperature Expansion valve closes a " 1. Improper expansion valve adjustment 2. Malfunctioning thermal valve 3. Outlet and inlet may be clogged. I Remove foreign particles I Check lubricant for con- An area of the low-pressure Low-pressure pipe is clogged I Check and repair malfunc- I Check lubricant for con- Air flow volume is not Evaporator is frozen. I Check thermo control I Replace compressor. GI MA EM LC EC FE CL MT AT AX SU BR ST RS BT SC EL IDX TROUBLE DIAGNOSES MANUAL Insufficient Cooling (Cont’d) HA-187 |