18 RAU-SVX01F-E4
Problems symptoms Problem cause Action recommended
D) The compressor keeps running without
stopping
Temperature too high in areas requiring air-
conditioning.
Excess load on cooling system. Check thermal insulation and air-tightness of
areas requiring air-conditioning.
E) Loss of oil in compressor
Oil level too low in indicator. Not enough oil. Contact Trane office before to order oil
Gradual fall in oil level.
Suction line too cold.
Compressor noisy
Filter drier clogged.
Liquid flows back to compressor.
Replace filter drier.
Adjust superheat and check bulb fixing of the
expansion valve.
F) Compressor noisy
Compressor knocks. Components broken in compressor. Change compressor.
Suction line abnormally cold. a) Uneven liquid flow.
b) Expansion valve locked in open position.
a) Check superheat setting and fixing of
expansion valve bulb.
b) Repair or replace.
G) Insufficient cooling capacity
Thermostatic expansion valve ”whistles”. Not enough refrigerant. Check refrigerant circuit tightness and add
refrigerant.
Excess pressure drops through filter drier. Drier filter clogged. Replace.
Excessive superheat. Superheat not properly adjusted. Check adjustment of superheat and adjust
thermostatic expansion valve.
H) Discharge pressure too high
Condenser abnormally hot. Presence of uncondensable liquids in system,
or excess refrigerant.
Purge uncondensable fluids and drain off
excess refrigerant.
Condenser air output too hot. Reduced air flow. Air intake temperature
higher than specified for unit.
Clean battery.
Check operation of motor fans.
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