Technical data

Fault Probable Cause Remedy
One or both compressors not
working.
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 unit. 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.
Low pressure switch cuts in, braking
circuit.
Gas leakage. Identify and eliminate leakage.
Insufficient charge. Top up charge.
Pressure switch failure. Replace pressure switch.
High pressure switch cuts in,
braking circuit.
High pressure switch malfunction. Check switch operation, replacing if
necessary.
Delivery valve partially closed. Open valve, replacing if necessary.
Non-condensables in circuit. Purge circuit.
Condenser water circuit dirty. Clean and descale if necessary.
Liquid line too hot. Insufficient charge. Identify and eliminate causes of
charge loss and top up charge.
Condenser water circuit dirty. Clean and descale if necessary.
Liquid line freezes. Liquid line valve partially closed. Check that all valves are open.
Receiver/drier clogged. Replace cartridge.
8-2 035B40022-000