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Code/meaning
F.022
No/insufficient water in the
product or the water pressure is
too low.
F.042
The coding resistor (in the wir-
ing harness) or the gas group
resistor (on the PCB, if avail-
able) is invalid.
F.279
Hot gas temperature monitoring
triggered
F.283
De-icing was unsuccessful.
F.504
The signal for fan 1 and/or the
fan speed is invalid.
F.514
Invalid compressor inlet temper-
ature sensor signal
F.517
Invalid compressor outlet tem-
perature sensor signal
F.519
Building circuit return temperat-
ure sensor signal invalid
F.520
Building circuit flow temperature
sensor signal invalid
F.526
The signal for the temperature
sensor at the evaporator inlet in
the refrigerant circuit is invalid.
F.546
Refrigerant circuit high-pressure
sensor signal invalid
F.582
A fault is detected when actu-
ating the electronic expansion
valve.
8000017440_FT Installation and maintenance instructions
Possible cause
Internal expansion vessel de-
fective
Interruption in the wiring har-
ness to the gas valve assembly
The compressor outlet temper-
ature is above 130 °C: Applica-
tion limits exceeded.
The electronic expansion valve
does not open correctly or does
not work.
Refrigerant volume too low due
to frequent defrosting as a res-
ult of extremely low evaporation
temperatures
Electric back-up heater is not
sufficient or is not available at
all.
Insufficient heat energy in the
house installation
Ice formation on the evaporator
The wiring harness is not cor-
rectly connected to the PCB
Interruption in the wiring har-
ness
Short circuit in the wiring har-
ness
Fan blocked
Fan defective
Temperature sensor at the com-
pressor inlet is defective or not
connected
Temperature sensor at the com-
pressor outlet is defective or not
connected
Return temperature sensor at
the heat pump is defective or
not connected
Flow temperature sensor at the
heat pump is defective or not
connected
Temperature sensor not con-
nected or sensor input has
short-circuited.
The refrigeration circuit pres-
sure sensor is defective or not
connected
EEV is not connected correctly
or there is a cable break to the
coil.
Measure
▶
Check the internal expansion vessel and replace it, if neces-
sary.
▶
Check the wiring harness between the PCB and gas valve
assembly, including all plug connections (especially on the
PCB).
1.
Check whether heat emission is possible.
2.
Check whether all single-room valves and isolation valves
are open.
3.
If fans are installed in the heating installation, check whether
these run in heating mode.
4.
Check the temperature sensors' compressor inlet and outlet.
5.
Check the condenser outlet temperature sensor (TT135).
1.
Check the electronic expansion valve (does the EEV move
to the limit stop?). Use the sensor/actuator test.
2.
Replace the electronic expansion valve.
1.
Check the refrigerant volume (see Technical data).
2.
Check the tightness of the refrigerant circuit.
3.
Check whether the service valves on the outdoor unit are
open.
▶
Check the setting for the electric back-up heater.
▶
Check the heating circuit setting. Ensure that all heating cir-
cuits are open during the de-icing.
▶
Check the outdoor unit for ice formation. Remove any existing
ice plates.
▶
Connect the wiring harness to the PCB correctly.
▶
Check the wiring harness including all plug connections and, if
required, replace it.
▶
Check the wiring harness and, if required, replace it.
▶
Check that the fan is working correctly.
▶
Replace the fan.
▶
Check: Plug, temperature sensor, wiring harness, PCB.
▶
Check: Plug, wiring harness, sensor, PCB.
▶
Check: Plug, wiring harness, sensor, PCB.
▶
Check: Plug, wiring harness, sensor, PCB.
▶
Check: Plug, temperature sensor, wiring harness.
▶
Check: Plug, wiring harness, pressure sensor.
▶
Check: Plug connections and, if required, replace the coil from
the EEV.
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