MPE
54
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RG66007169 - Rev 00
12 TROUBLESHOOTING
SYMPTOM
G
Lack of gas
I
Frost in liquid pipe
downstream from a filter
L
The unit works
continuously without ever
stopping
M
The unit works
regularly but with an
insufficient capacity
N
F r o s t i n t h e
compressor intake pipe
O
The defrosting cycle
is never activated
P
Abnormal noises
detected in the system
Cooling
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Heating
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Who can take
corrective action
U
= User
S
= specialised
personnel
S
S
S
U
S
S
S
S
S
S
S
S
S
S
S
S
S
Possible control
panel indication
L1
H1
L1
Probable cause
Cooling circuit leak
Liquid filter clogged
Lack of refrigerant gas
Wrong setting of operating thermostat
Thermal overload
Compressor does not provide the rated heating capacity
Liquid filter clogged
Low level of refrigerant
4-way cycle reversing valve defective
Expansion valve is not working properly
Water circulation pump blocked
Water circulation pump defective
Low level of refrigerant
Liquid filter clogged
4-way cycle reversing valve defective
The defrost thermostat has broken down or has been
set incorrectly
The compressor is noisy
The panels vibrate
Possible remedy
Check the cooling circuit using a leak
detector after pressurising the circuit to
approximately 4 bars.
Repair, evacuate and refill.
Replace the filter
See item G
Check the setting
Reduce the thermal load
Check and replace or overhaul
Replace
See item G
Check the valve power supply and coils
and replace the valve if necessary
Check replace
Release the pump
Check the pump and replace it if necessary
See item G
Replace
Check the valve power supply and coils
and replace the valve if necessary
Check and replace if defective or change
the setting
Check and replace if necessary
Fasten properly
