OPERATING AND INSTALLATION MANUAL HEAT PUMP COMBI UNIT PKOM4 PAGE 49
USER
GENERALSPECIALIST PERSONNEL
14
T10 - sensor
in WT2
The temperature sensor of
heat exchanger WT2 in the
supply air is defective or the
cable is broken
Check terminal T10 on heat pump board N3 Restore terminal contacts
Check the temperature sensor using a measuring
device – resistance value according to table 1
Replace the sensor
No error detectable Please contact your service partner
15
T12 - sensor
upstream of
WT2
The temperature sensor
upstream of heat exchanger
WT2 in the supply air is de-
fective or the cable is broken
Check terminal T12 on ventilation board N3 Restore terminal contacts
Check the temperature sensor using a measuring
device – resistance value according to table 1
Replace the sensor
No error detectable Please contact your service partner
16
T13 - sensor
heating/cooling
compressor
The hot gas temperature sen-
sor of the "heating/cooling"
compressor" is defective or
the cable is broken
Check terminal T13 on heat pump board N3 Restore terminal contacts
Check the temperature sensor using a measuring
device – resistance value according to table 1
Replace the sensor
No error detectable Please contact your service partner
17
T21 - sensor
Tank centre
The centre temperature
sensor in the service water
tank is defective or the cable
is broken
Check terminal T21 on heat pump board N3 Restore terminal contacts
Check the temperature sensor using a measuring
device – resistance value according to table 1
Replace the sensor
CAUTION: Sensors T21 and T20 must be
replaces as set!
No error detectable Please contact your service partner
18
T20 - sensor
Tank bottom
The bottom temperature
sensor in the service water
tank is defective or the cable
is broken
Check terminal T20 on heat pump board N3 Restore terminal contacts
Check the temperature sensor using a measuring
device – resistance value according to table 1
Replace the sensor
CAUTION: Sensors T21 and T20 must be
replaces as set!
No error detectable Please contact your service partner
19
T22 - sensor
service water
compressor
The hot gas temperature
sensor of the "service water"
compressor is defective or
the cable is broken
Check terminal T13 on heat pump board N3 Restore terminal contacts
Check the temperature sensor using a measuring
device – resistance value according to table 1
Replace the sensor
No error detectable Please contact your service partner
20
T30 - sensor
EV heating
The temperature sensor of
the refrigerant suction line in
heating mode is defective or
the cable is broken
Check terminal T30 on heat pump board N3 Restore terminal contacts
Check the temperature sensor using a measuring
device – resistance value according to table 2
Replace the sensor
No error detectable Please contact your service partner
21
T31 - sensor
EV service
water
The temperature sensor of
the refrigerant suction line in
service water mode is defec-
tive or the cable is broken
Check terminal T31 on heat pump board N3 Restore terminal contacts
Check the temperature sensor using a measuring
device – resistance value according to table 2
Replace the sensor
No error detectable Please contact your service partner
22
T32 - sensor
EV cooling
The temperature sensor of
the refrigerant suction line in
cooling mode is defective or
the cable is broken
Check terminal T30 on heat pump board N3 Restore terminal contacts
Check the temperature sensor using a measuring
device – resistance value according to table 2
Replace the sensor
No error detectable Please contact your service partner
23
T40 - sensor
room
The room temperature
sensor T40 is defective or the
cable is broken
Check terminal T40 on the main board N1 Restore terminal contacts
Check the temperature sensor using a measuring
device – resistance value according to table 1
Replace the sensor
No error detectable Please contact your service partner
24
A1 - pressure-
transmitter
heating/cooling
The pressure transmitter in
the "heating/cooling" cooling
circuit is measuring outside
its circuit or is defective, or
the cable is broken
Check the plug on the pressure transmitter B33 Restore contact with plug
Check terminal A1 on heat pump board N3 Restore terminal contacts
Check the cable Replace the cable
Check pressure transmitter B33 Replace the pressure transmitter
No error detectable Please contact your service partner
25
A2 - pressure-
transmitter
service water
The pressure transmitter in
the "heating/cooling" cooling
circuit is measuring outside
its circuit or is defective, or
the cable is interrupted
Check the plug on the pressure transmitter B33 Restore contact with plug
Check terminal A1 on heat pump board N3 Restore terminal contacts
Check the cable Replace the cable
Check pressure transmitter B33 Replace the pressure transmitter
No error detectable Please contact your service partner
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