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Troubleshooting
Anomaly
Cause
Operation
One or both compressors
are not working.
Breaking of the electric circuit.
Check the electric circuit and detect
any ground dispersions and short cir-
cuits. Check fuses.
Intervention of the HP pressure
switch.
Reset the pressure switch and the con-
trol panel and restart the appliance.
Identify and remove the cause that en-
abled the pressure switch.
The fuse of the control circuit is bro-
ken.
Check for ground dispersions and
short circuits. Replace fuses.
Loosened terminals.
Check and tighten.
Halt caused by thermal overload of
the electric circuit.
Check the operation of check and
safety devices. Identify and remove
the cause.
Wrong wiring.
Check wiring of check and safety de-
vices.
The line voltage is too low.
Check voltage. If problems regard the
system, solve them. If they are caused
by the distribution network, inform the
Energy Distributor.
Short-circuit of the compressor’s mo-
tor.
Check the continuity of the winding.
Seized compressor.
Replace the compressor.
Identify and remove the leak.
Insufficient charge
Refill.
Failure of the pressure switch.
Replace the pressure switch.
Failure of the pressure switch.
Check the operation of the pressure
switch, replace it if defective.
The delivery valve is partially
closed.
Open the valve and replace it, if
faulty.
Activation of the LP alarm,
stop of the unit.
Gas leak.
Activation of the HP alarm,
stop of the unit.
Substances with condensable gases
in the circuit.
Drain the circuit.
The fan of the condenser is stopped.
Check cables and motor. If defective,
repair or replace.
The liquid line is too hot.
Insufficient charge.
Identify and remove the cause of the
loss of charge and refill.
Frosting of the liquid line.
The valve of the liquid line is partial-
ly closed.
Check that valves are open.
The liquid filter is clogged.
Replace the cartridge or the filter.
Manuale VLS-VLH2 17-06-2005 11:18 Pagina 74
