LCP
RG66006889-Rev.01
33
FAULT
Possible causes
Corrective actions
Low condensation pressure.
Transducer
fault.
Check the transducers and the
efficiency of the needle pusher on
the Schrader valves they are
connected to.
Outdoor T too low and/or presence
of strong winds.
Install the condensation control
device and/or protect the unit from
prevalent winds.
Low water T, in the case of heat
pump operation.
Check whether the thermal load is
compatible with the unit’s potential.
Low evaporation pressure.
Insufficient flow of water.
Check whether the pumps are
rotating in the right direction. Check
the water system for pressure
drops. Check the efficiency of the
pump system check valve
(optional).
Malfunctioning of thermostatic
valve.
Warming the bulb with your hand,
check whether the valve opens and
adjust it if necessary. If it does not
respond, replace it.
Filter clogged.
Pressure drops upstream and
downstream from the filter should
not exceed 2°C. If they do, replace
the filter.
Low
condensation
T.
Check the efficiency of the
condensation control device [where
present].
Low
level
of
refrigerant.
Check the refrigerant level by
measuring the degree of
subcooling; if it is below 2°C
replenish the charge.
Coil covered with frost, in the case
of heat pump operation.
Check whether the defrost
parameters have been properly set.
Check the efficiency of the 4-way
valve.
Low outdoor T, if the unit is
operating with the heat pump on.
Check compliance with the
operating limits and eliminate any
bypasses and back flow of air.
The compressor does not start.
The internal thermal protection
device has tripped.
In the case of compressors
equipped with a protection module,
check the thermal contact. Identify
the causes after restarting.
The circuit breakers or line fuses
have been tripped by a short
circuit.
Pinpoint the cause by measuring
the resistance of the individual
windings and the insulation to the
casing before restoring power.
One of the high or low pressure
switches has tripped.
Check on the microprocessor,
eliminate the causes.
The phases have been reversed in
the distribution compartment.
Check the phase sequence relay.
