Thermics LUNA 2T, Installation, Technical And Maintenance Manual

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35
LUNA 2T | MAINTENANCE
6.3 Faults, causes and solutions
F
aUlT
C
aUse
s
olUTion
U/i/a
The heat pump
does not start
Lack of voltage Check for voltage I
Check upstream safety systems U
Main switch in pos. OFF Set to ON U
Remote switch in OFF position Set to ON U
Control panel in OFF position Set to ON U
Main switch in OFF position Set to ON U
Compressor thermal-magnetic
circuit breaker to OFF
Set to ON I
Low supply voltage Check the power supply line I/A
Faulty compressor Replace the component I/A
Insufficient
performance
Lack of refrigerant Check charge I
Incorrect sizing of the equipment Check I
Operation outside the operating
conditions recommended by the
manufacturer
Check parameters I
Compressor
loud
Part of the cooling circuit in
contact with the structure
Check I
Return of liquid to the compressor Check A
Unsuitable unit fixing Check I
Power cable with inverted phase Reverse a phase I
Noise and
vibrations
Contacts with metal bodies Check I
Loose or missing screws Tighten the screws I
High compression
delivery pressure
(over 35 bar)
Fan stopped in summer mode Check I
High system water temperature in
winter mode
Check I
High DHW circuit temperature Check I
Air in the hydraulic system in
winter operation
Vent the air from the circuit I
Thermostatic expansion valve
failure in heating mode
Check and if necessary replace
the component
A
Insufficient flow to the DHW heat
exchanger in DHW operation
Check the pump I
Insufficient flow to the system heat
exchanger in winter operation
Check the pump I