Appendix
0020257319_02 Hydraulic station Installation and maintenance instructions 53
H Comfort protection mode
Code Meaning Description Remedy
200 Sensor fault: Temp. air inlet Still possible to operate with existing,
functional outdoor temperature sensor
Replace the air inlet sensor
I Fault codes
In the event of faults which are caused by components in the refrigerant circuit, inform customer service.
Code Meaning Cause
Remedy
F.022 Water pressure too low – Pressure loss in the building circuit
due to leakages or air pockets
– Building circuit pressure sensor
defective
– Check the building circuit for leaks
– Top up with water, purge
– Check the quality of the plug contact
on the PCB and on the cable har-
ness
– Check that the pressure sensor is
working correctly
– Replace the pressure sensor
F.042 Fault: Coding resistor – Coding resistor damaged or not set – Check that the coding resistor is
positioned correctly and, if required,
replace it.
F.073 Sensor fault: Build. circ. pressure – The sensor is not connected or the
sensor input has short-circuited
– Check and, if required, replace the
sensor
– Replace the cable harness
F.514 Sensor fault: Compr. inlet temp.
– The sensor is not connected or the
sensor input has short-circuited
– Check and, if required, replace the
sensor
– Replace the cable harness
F.517 Sensor fault: Compr. outlet temp. – The sensor is not connected or the
sensor input has short-circuited
– Check and, if required, replace the
sensor
– Replace the cable harness
F.519 Sensor fault: Building circuit re-
turn temp.
– The sensor is not connected or the
sensor input has short-circuited
– Check and, if required, replace the
sensor
– Replace the cable harness
F.520 Sensor fault: Building circuit flow
temp.
– The sensor is not connected or the
sensor input has short-circuited
– Check and, if required, replace the
sensor
– Replace the cable harness
F.526 Sensor fault: EEV outlet temp. – The sensor is not connected or the
sensor input has short-circuited
– Check and, if required, replace the
sensor
– Replace the cable harness
F.546 Sensor fault: High pressure – Sensor not connected or sensor
input has short-circuited
– Check the sensor (e.g. using an in-
stallation aid), and replace if neces-
sary
– Replace the cable harness
F.582 Fault: EEV – EEV is not connected correctly or
there is a cable break to the coil
– Check the plug connections and, if
required, replace the coil from the
EEV
F.585 Sensor fault: Capac. outlet temp. – The sensor is not connected or the
sensor input has short-circuited
– Check and, if required, replace the
sensor
– Replace the cable harness
F.718 Fan unit 1: Fan blocked – There is no confirmation signal stat-
ing that the fan is rotating
– Check the air route and, if required,
remove any blockages
F.729 Compressor outlet temperature
too low
– The compressor outlet temperature
is lower than 0 °C for more than 10
minutes or the compressor outlet
temperature is lower than -10 °C
even though the heat pump is in the
operating characteristics.
– Checking the high-pressure sensor
– Checking that the EEV is working
correctly
– Checking for condensate leaking
from the temperature sensor (under-
cooling)
– Check whether the 4-port diverter
valve is in the intermediate position
– Checking the refrigerant volume for
overfilling
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