Glow-worm Clearly Heat Pumps 5kW - Manual (Page 23)

0020096879_01 - 06/10 - Glow-worm
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MAINTENANCE
fault
codes Description
Cause Solution
554
Operation outside the
compressor shell
- in heating mode :
(BP> 15 Bar or HP <11 bar or
HP> 40 Bar).
- in cooling mode :
(BP< 4.5 Bar or BP > 15 Bar or
HP < 11 Bar or HP > 40 Bar).
Non-blocking failure.
An excess or a lack of refrigerant.
Measure the air and water’s ΔT. If it is very low (<2K), lack of fluid
may be the cause (loss of heat output). Measure the real overheating
(must be <7K in heating mode). Measure the electrical current with an
ammeter. If the current is below 4.5 amps, the cause may be a lack of
fluid.
Check the pressure with a monometer.
Check that there are no leaks, repair them if necessary.
Adjust the amount of refrigerant.
Presence of incondensables.
Measure the discharge temperature. High temperatures (> 90 ° C in
cool environmental conditions from 0 to 12 ° C) may be due to the
presence of incondensables. Use a manometer to check the presence
of incondensables. Following prolonged periods of inactivity of the
compressor, ensure that the temperatures indicated correspond
to those of the fluid temperature (environmental or condenser or
evaporator).
The electronic expansion valve is
defective.
Check that the electronic expansion valve is working correctly, if this is
not the case:
Check the winding resistance.
Clip the electronic expansion valve back on.
Replace the motor.
Replace the electronic expansion valve, check that there are no leaks.
Pre-expansion in the liquid line
(load loss)
Check the appearance of the condenser output tubes leading to the
evaporator (do not pinch).
Insufficient heat exchange at the
plate to plate exchanger or tube
exchanger.
Check for accumulation of dirt in the heat exchanger plates.
Check for obstruction of the fan grille.
The 4-way valve is defective.
Check the power supply to the valve. Force in the defrost mode and
check the reverse cycle.
If the reverse cycle does not work, change the valve. If the problem
persists:
Check the temperatures of the 4-way valve’s input and output tubes.
Those of the suction tubes must be identical, but lower than those of
the discharge. If this is not the case, the 4-way valve’s slide is stuck in
an intermediate position, change the 4-way valve. Check for leaks and
repair if necessary.
The heating outlet and return
temperature sensors are
defective
Check the sensor connections.
Check that the sensor position and operation are correct.
Check the sensor resistance.
The air temperature is too high in
heating mode
Check the agreement between the outside sensor and heat pump air
inlet temperature sensor.
Check that the heat pump air inlet temperature sensor is working
properly.
The air temperature is too high in
cooling mode
Check the agreement between the outside sensor and heat pump air
inlet temperature sensor.
Check that the heat pump air inlet temperature sensor is working
properly.
581
Failure of the defrosting
temperature sensor.
The sensor is defective or is not
correctly connected to the main
PCB.
Check the sensor’s connections. Check that the position and the
operation of the sensor are correct.
Check the sensor’s resistance.
582 Failure of motor regulator.
The regulator’s motor or its
connection is faulty
Check the winding resistance.
Check the condition of the regulator’s cables.
Check the regulator’s 24 V power supply at the main PCB.
Replace the motor.
583
The temperature of the plate
heat exchanger is too low
(<0ºC).
Non-blocking failure
Incorrect setting. Check the control unit settings.
A temperature sensor is poorly
positioned.
Check the position of the external temperature sensors.
Ensure an optimum thermal contact.