Symptom
Cooling
Who can take
corrective action
U = User
S = specialised
personnel
Probable cause
Possible remedy
M Frost in the
compressor
intake pipe
x
s
Expansion device that is not
working properly
Verify and replace.
x
s
Water circulation pump blocked
Unlock the pump.
x
s
Water circulation pump defective Check the pump and replace if
necessary.
x
s
Low refrigerant charge
See point G.
x
s
The liquid filter is clogged
Replace.
N Abnormal
noise detected
in the system
x
s
Compressor noisy
Check and replace if necessary.
x
s
The panel vibrate
Fasten properly.
O The unit does
not start
x
s
Phases of the supply network
reversed
Invert two phases.
