Fault diagnosis and rectification
Installation instructions geoTHERM 0020051574_04
103
11
Fault code
Error text/description
Emergency
mode
Possible cause
Solution
32
Error heat source sen-
sor T8
Short circuit/disconnec-
tion in the sensor
possible
The internal temperature sensor
for the brine outlet temperature
is faulty or not plugged in cor-
rectly on the circuit board.
>
Check the quality of plug contact on
the circuit board and on the cable har-
ness.
>
Check sensors for correct operation
(resistance measurement based on VR
11 characteristics,
¬
Tab.
17.2
).
>
Replace the sensors.
33
Error heat circuit pressure
sensor
Short circuit/disconnec-
tion in the pressure sensor
_
The pressure sensor in the heat-
ing circuit is faulty or not prop-
erly plugged in.
>
Check the quality of plug contact on
the circuit board and on the cable har-
ness.
>
Check the pressure sensor for correct
operation.
>
Replace the pressure sensor.
34
Error brine pressure sen-
sor
(VWS only)
Short circuit/disconnec-
tion in the pressure sensor
possible
The pressure sensor in the brine
circuit is faulty or not properly
plugged in.
40
Error comp outlet sensor
T1
Short circuit/disconnec-
tion in the sensor
possible
The internal temperature sensor
on the high pressure side of the
compressor is faulty or not prop-
erly plugged into the PCB.
>
Check the quality of plug contact on
the circuit board and on the cable har-
ness.
>
Check sensors for correct operation
(resistance measurement based on VR
11 characteristics,
¬
Tab.
17.2
).
>
Replace the sensors.
41
Error heat source sen-
sor T3
Short circuit/disconnec-
tion in the sensor
possible
The internal temperature sensor
for the brine inlet temperature is
faulty or not plugged in correctly
on the circuit board.
42
Error HP return sensor T5
Short circuit/disconnec-
tion in the sensor
possible
The internal temperature sensor
on the heating return line is
faulty or not properly plugged
into the PCB.
43
Error HP flow sensor T6
Short circuit/disconnec-
tion in the sensor
possible
The internal temperature sensor
on the heating flow line is faulty
or not properly plugged into the
PCB.
44
Error outdoor sensor AF
Short circuit/disconnec-
tion in the sensor
possible
The outside temperature sensor
or its connecting cable is faulty
or it is not connected correctly.
>
Check the Pro-E plug on the circuit
board, check the connection line.
>
Replace the sensors.
45
Error DHW tank sensor SP
Short circuit/disconnec-
tion in the sensor
possible
The temperature sensor in the
DHW tank is faulty or it is not
connected correctly.
>
Check the Pro-E plug on the circuit
board.
>
Check sensors for correct operation
(resistance measurement based on VR
10 characteristics,
¬
Tab. 17.1
).
>
Replace the sensors.
46
Error HB flow sensor VF1
Short circuit/disconnec-
tion in the sensor
possible
The flow temperature sensor of
the buffer tank is faulty or the
connection is incorrect.
47
Error HB return sensor
RF1
Short circuit/disconnec-
tion in the sensor
possible
The return temperature sensor of
the buffer tank is faulty or the
connection is incorrect.
48
Error flow sensor VF2
Short circuit/disconnec-
tion in the sensor
Hot water
mode possi-
ble
The clamp-on temperature sensor
VF2 in the heating circuit is faulty
or it is not connected correctly.
11.4
Fault with permanent switch-off
