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LCA
FAULT
Low condensation pressure
Low evaporation pressure
The compressor does not start
RG66000986 – Rev.00
Possible causes
Transducer fault
Outdoor T too low and/or presence
of strong winds
Low water T, in the case of heat
pump operation
Insufficient flow of water
Malfunctioning
of
thermostatic
valve
Filter clogged
Low condensation T
Low level of refrigerant
Coil covered with frost, in the case
of heat pump operation
Low outdoor T, if the unit is
operating with the heat pump on
The internal thermal protection
device has tripped
The circuit breakers or line fuses
have been tripped by a short circuit
One of the high or low pressure
switches has tripped
The phases have been inverted in
the distribution compartment
27
Corrective actions
Check the transducers and the
efficiency of the needle pusher on
the
schrader
valves
connected to
Install the condensation control
device and/or protect the unit from
prevalent winds
Check whether the thermal load is
compatible with the unit's potential.
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)
Warming the bulb with your hand,
check whether the valve opens and
adjust it if necessary. If it does not
respond, replace it.
Pressure
drops
upstream
downstream from the filter should
not exceed 2°C. If they do, replace
the filter.
Check
the
efficiency
condensation control device [where
present]
Check the refrigerant level by
measuring
the
degree
undercooling; if it is below 2°C
replenish the charge
Check
whether
the
parameters have been properly set.
Check the efficiency of the 4-way
valve.
Check
compliance
operating limits and eliminate any
bypasses and back flow of air.
In the case of compressors
equipped with a protection module,
check the thermal contact. Identify
the causes after restarting.
Pinpoint the cause by measuring
the resistance of the individual
windings and the insulation from the
casing before restoring power.
Check
on
the
microprocessor,
eliminate the causes.
Check the phase sequence relay.
they
are
and
of
the
of
defrost
with
the
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