Glow-worm Clearly Heat Pumps Envirosorb3 - Manual (Page 25)

0020154078_00 - 02/13 - Glow-worm 25
APPENDIX
Fault
codes Description
Possible cause
514
The compressor inlet
temperature sensor or
connection is out.
The sensor is defective or is not
correctly connected to the main
PCB.
517
The compressor outlet
temperature sensor or
connection is out.
519
The heating return
temperature sensor or
connection is out.
520
The fl ow heating
temperature sensor or
connection is out.
526 Coil sensor interrupt or
short circuit.
532
The fl ow on heat pump
water circuit is too low
or too high (see section
5.4.2).
Water pump defective.
There is a lack of water.
Anti-silt fi lter missing or clogged
in the brine water circuit’s
backfl ow.
The circuit was not properly bled.
The pressure drop is too high in
the hydraulic circuit.
536
The compressor
discharge temperature
is too high (depends
on the compressor
operating zone).
The compressor safety thermostat
is tripped.
The pressure switch or its
electrical connection is defective.
The refrigerant fl uid level is low
The sensor is defective or is not
correctly connected to the main
PCB.
Pre-expansion in the liquid line
(load loss)
The electronic expansion valve is
defective.
The plate exchanger is clogged.
755 Position of 4-way valve
error.
There is a mechanical or electrical
problem. Force the 4-way valve
from the control box. While
forcing, check that the coil voltage
is correct.
537
The discharge pressure
on compressor is too
high.
Blocking fault after 3rd
trigger attempt
There is an excess or a lack of
refrigerant.
Vacuum insuffi cient
Presence of incondensables in the
circuit
The pressure switch or its
electrical connection is defective.
537
The discharge pressure
on compressor is too
high.
Blocking fault after 3rd
trigger attempt
Pre-expansion in the liquid line
(load loss)
Poor water fl ow rate.
The water fl ow sensor is defective.
Insuffi cient heat exchange at the
plate to plate exchanger.
539
The pressure of the
low pressure circuit is
too low.
Lack of refrigerant.
Lack of airfl ow.
There is no defrosting.
The condensate tray resistance
heater is faulty.
The 4-way valve is defective.
The electronic expansion
valve’s motor is defective or the
connection is defective.
546 Cooling circuit pressure
sensor fault.
The sensor is defective or not
correctly connected to the main
circuit board.
Fault
codes Description
Possible cause
554 Operation outside the
compressor's limit.
An excess or a lack of refrigerant.
Presence of incondensables.
The electronic expansion valve is
defective.
Pre-expansion in the liquid line
(load loss)
Insuffi cient heat exchange at the
plate to plate exchanger or tube
exchanger.
The 4-way valve is defective.
582
The expansion valve
motor or connection
is out.
The wiring harness is damaged or
disconnected.
585
The subcooling
temperature sensor
in heating mode or
connection is out.
The sensor is defective or is not
correctly plugged in to the main
PCB.
685 eBus communication
with heat pump is out.
The appliance is not connected to
the control box.
The cable polarity is reversed.
750 Compressor
disconnected.
The wiring harness is damaged or
disconnected.
751 Compressor
overcurrent.
Compressor fault.
The heat pump supply voltage is
too low.
The fi nned heat exchanger is
dirty.
The plate heat exchanger is dirty.
752 Inverter driver error.
The inverter box is damaged.
The inverter box radiator is
blocked.
The supply voltage is incorrect.
753 Communications error
with the inverter box.
The connection between the main
circuit board and the inverter box
is damaged or disconnected.
The inverter box is not powered
up.
754 Fan coil board internal
error (FMU).
The fan is defective.
The connection between the main
circuit board and the fan card is
damaged or disconnected.
The fan card is defective.
The fan card power supply is
defective.
774
The air inlet
temperature sensor or
connection is out.
The sensor is defective or not
correctly connected to the main
circuit board.
For further technical information please
call 0844 736 1143