Vaillant geoTHERM Installation Instructions Manual page 103

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