LCX
RG66010687_rev.00
39
FAULT
Analysis of possible causes
Corrective action
The unit does not start.
No electrical power supply.
Check its presence both on the
primary and auxiliary circuit.
The circuit board is not powered.
Check the protections.
There are alarms present.
Check the microprocessor panel
for the presence of alarms,
eliminate their cause and restart
the unit.
Incorrect
phase
sequence.
Invert the two primary power
supply phases after having
isolated the unit upstream.
The compressor is noisy.
The compressor is not turning in
the right direction.
Check the phase sequence relay.
Invert the phases on the terminal
board after having isolated the unit
and contact the manufacturer.
Presence of abnormally high
pressure.
Insufficient air flow rate to
condenser.
Check that all fans turn correctly.
Check the condenser air inlet T
and prevent recirculation from
being formed.
Check that the effective voltage
RMS to the fans is the maximum.
Check the pilot pressure
transducers of the rev. regulator
[optional].
Make sure the finned coils are
clean.
Presence of air in circuit, detected
by the presence of air bubbles on
the flow indicator even with sub-
cooling values above 5°C.
Drain and pressurise the circuit
and check for leaks. Execute a
slow emptying [greater than 3
hours] until the value of 15 Pa and
then recharge in liquid phase.
Unit too loaded detectable by sub-
cooling greater than 8 °C.
Discharge circuit.
Thermostat valve and /or filter
clogged. These aspects are also
present with low pressure faults.
Check the temperatures upstream
and downstream from the valve
and filter and replace them if
necessary.
Insufficient water flow rate if heat
pump is operating.
Check the load loss of the
hydraulic circuit and/or the correct
functioning [rotation direction] of
the pump. Check the outlet water T
and make sure it is 45°C or less.
