15
TROUBLESHOOTING CHART
Below we list a series of possible faults, along with the probable causes and suggested solutions. In the event of a unit
malfunction, it is advisable to disconnect the power supply and ascertain the cause.
SYMPTOMS CAUSE REMEDY
Unit does not start
Unit operates continually or
starts and stops frequently
Compressor continually cuts out
at low pressure or via the DGT
Compressor continually cuts out
at high pressure
Noises in the system
Compressor loses oil
Water losses
Lack of power supply
Main switch open
Low line voltage
A protection device has tripped
Contactor stuck open
Seized compressor or short circuit
Loose electrical connections
Defective compressor contactor
Defective compressor
Refrigerant losses
Refrigerant losses
Low water flow in the evaporator
Blocked expansion valve
Blocked filter drier
Defective high pressure switch
Defective fan(s)
Low water flow in the condenser
Piping vibrations
Noisy compressor
Badly fitting panels
Leak in the system
Defective inlet or outlet connections
Connect power supply
Close switch
Check voltage and remedy the deficiency
Reset
Replace contactor
Check windings (grounded or short circuit),
replace compressor
Check connections
Replace contactor
Check valves, replace compressor
Check and add the necessary charge
Add the necessary refrigerant charge
Check water pump
Clean or replace
Replace filter
Replace pressure switch
Check the fan(s) and the contactor(s)
Clean the condenser
Support piping, check supports and
tightness
Check valve plate, change if necessary
Install correctly
Repair leak
Check and tighten if necessary
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