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Symptom
Cooling
x
x
M Frost in the
compressor intake
x
pipe
x
x
x
N Abnormal noise
detected in the
x
system
O The defrosting
cycle is never
activated
P The unit does
x
not start
IMPROPER USES
17
The unit is projected and built up to grant the maximum safety in its proximity, as well as to resist to the aggressive
environmental conditions. The fans are protected by grilles.
Residual risks are indicated with warning labels.
SAFETY SYMBOLS
DANGER:
General danger
Who can take
corrective action U
= User
Heating
S = specialised
personnel
x
s
x
s
x
s
x
s
x
s
x
s
x
s
x
s
x
s
x
s
DANGER:
Temperature
Page 35
Probable cause
Expansion device that is not working
properly
Water circulation pump blocked
Water circulation pump defective
Low refrigerant charge
The liquid filter is clogged
Compressor noisy
The panel vibrate
4-way reversing valve defective
The defrost thermostat is worn out or
has an incorrect calibration value
Phases of the supply network
reversed
DANGER:
Moving parts
Possible remedy
Verify and replace.
Unlock the pump.
Check the pump and replace if necessary.
See point G.
Replace.
Check and replace if necessary.
Fasten properly.
Check the power supply and the coil
of the valve and replace the valve.
Check and replace if defective or
change the calibration value.
Invert two phases.
DANGER:
Cutoff voltage
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