8
TROUBLE SHOOTING
The following table details possible unit faults, their probable cause and suggested remedies. For any other
problems not immediately recognisable and/or for technical assistance, contact an Authorised York Service Centre.
(09/03)
035B09012-100 Rev. 4
8
-
1
Fault
Probable Cause
Remedy
Low refrigerant charge.
Top up charge.
Drier/filter clogged.
Replace drier/filter.
Loss of efficiency in one or both circuits. Check compressor valves, replacing if
necessary.
Temperature rise of thermostatic valve
out of calibration.
Increase setting.
Check charge
Vibrating lines.
Secure lines.
Check line retention.
Thermostatic expansion valve hiss.
Top up charge.
Check filter/drier, replacing if necessary.
Noisy compressor.
Check condition of valves.
Bearings have seized; replace compressor.
Check that compressor retaining nuts are tight.
One or more gas or oil leaks in circuit.
Identify and eliminate all leaks.
Mechanical damage to compressor.
Call an Authorised York Service Centre.
Faulty crankcase oil heater.
Check electrical circuit and crankcase heater
element operation, replacing any defective
components.
Power circuit interrupted.
Check power circuit for earth leakage and shorts.
Check fuses.
High pressure switch activation.
Reset pressure switch from panel and re-start
machine. Identify and eliminate causes of
pressure switch activation.
Control circuit fuse blown.
Check control circuit for earth leakage and
shorts. Change fuses.
Loose terminal clamps.
Check clamp tightness.
Power circuit thermal overload cut-out
activation.
Check operation of control and safety devices.
Identify and eliminate cause of activation.
Incorrect wiring.
Check control and safety device wiring.
Line voltage too low.
Check line voltage. If problem due to system,
eliminate it. If problem is due to distribution
network, inform the electricity supply company.
Compressor motor short-circuited.
Check motor winding continuity
Compressor seizure.
Replace compressor.
Unit operates continuously,
but without cooling.
Suction line freezes.
Excessive noise.
Low compressor oil level.
One or both compressors
not working.
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