EN/
/0915/WLA Compact
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10. Troubleshooting
Refer to the general safety rules indicated in paragraph 2.2. All the operations described in this chapter must be
performed only by qualified personnel according to that specified in paragraph 1.1.
Problem
Possible cause
Recommended intervention
MAIN
1.
The chiller fails to start
no external consents
check the presence of external consents.
incorrect external consent connection
check the external consent connections
the anti-circulation timer is on
wait 5 minutes
2.
the compressor fails to
start
defective compressor
Use the testers to check the winding phases
if they are in short circuit and the correct
impedance. Repair/replace the motor.
The power circuit is open.
Check the power circuit
the compressor protection device is open
check the compressor work conditions
3.
compressor repeated
start ups and stops
defective compressor
check and/or replace it
minimum pressure switch intervention
see point v
defective compressor remote switch
check and/or replace it
incorrect thermostat configuration
check and restore the original configuration,
see point vii
no refrigerant
check and/or replace it
4.
high pressure switch
intervention
defective pressure switch
clean the filters and/or condenser
clogged air filter and/or condenser
see point vi
failed fan(s)
make sure that the liquid indicator indicates
the presence of humidity in the system or of
bubbles in the liquid indicator during normal
operation. Replace the gas filter.
clogged refrigerant filter
remove the refrigerant in excess. If the
condensation pressure is too high and if there
are no additional anomalies in the system, pay
attention because zeotropic blends, as r407c,
allow you to discharge the circuit partially.
excessive refrigerant gas charge
check and/or replace it
5.
minimum pressure
switch intervention
defective pressure switch
see point vii
no refrigerant gas
check and open the valves completely
valves closed partially on liquid line
check and/or replace it, see point iv
clogged refrigerant filter
check if the machine does not cool down and
if the low pressure side has a too low pressure.
Replace it if required
Blocked thermostatic valve
check if fluid circulates in the evaporator.
no thermal load
add liquid
insufficient tank liquid level
check and/or replace it
6.
the fan fails to start
defective fan remote switch
check the fan motor insulation
fan circuit breaker intervention
check and/or replace it, see point ii
defective fan motor
pressurise the circuit at 10 bar. Identify the leak
with a leak detector.
7.
no refrigerant
leak from the refrigerant circuit
Fill, repair, make the vacuum and refill.
8.
Frost thermostat
Blocked thermostatic valve
check and/or replace it
no refrigerant gas
see point vii
