Vaillant geoTHERM Operating Instructions Manual page 98

5 Troubleshooting
Fault code Fault text/description
32 Error heat source outlet sensor T8
Short circuit in sensor.
33 Error in pressure sensor
Short circuit in pressure sensor
34 Error in pressure sensor
(VWS only)
Short circuit in pressure sensor
40 Error comp outlet sensor T1
Short circuit in sensor
41 Error heat source inlet sensor T3
Short circuit in sensor.
42 Error HP return sensor T5
Short circuit in sensor.
43 Error HP flow sensor T6
Short circuit in sensor.
44 Error external sensor AF
Short circuit in sensor.
45 Error DHW tank sensor SP
Short circuit in sensor.
46 Error HB flow sensor VF1
Short circuit in sensor.
47 Error HB return sensor RF1
Short circuit in sensor.
48 Error flow sensor VF2
Short circuit in sensor.
52 Sensors do not match hydraulic
scheme
60 Heat source frost protect source
outlet monitoring
Error 20 has occurred three times
in a row.
61 Heat source frost protect source
(VWW only) outlet monitoring
Error 21 has occurred three times
in a row.
62 Heat source frost protect source
(VWS only) outlet monitoring
Error 22 has occurred three times
in a row.
5.3 Fault with permanent lock-out
42
Emergency
Fault code
mode
possible 63
(VWW only)
not possi-
ble
72
possible
possible
81
possible
83
possible
possible
84
possible
possible 85
possible 86
possible 90
Hot water
handling
possible
_
91
(VWS only)
possible
94
possible
95
possible
96
5.3 Fault with permanent lock-out
Fault text/description
No ground water flow
Error 23 has occurred three times
in a row.
CH flow temperature too high for
floor heating
Flow temperature higher than set
value for 15 min. Sensor or controller
defective.
Refrigerant pressure too high
Error 27 has occurred three times
in a row.
Refrigerant pressure too low;
check heat source.
Error 28 has occurred three times
in a row.
Refrigerant pressure outside the
range
Error 29 has occurred three times
in a row.
Error CH pump
Short circuit or dry run
Failure brine pump
Short circuit or dry run.
System pressure too low
Pressure <0.5 bar
Heat pump shuts down and restarts
automatically when the pressure
rises above 0.7 bar
Brine pressure too low
Pressure < 0.2 bar
Heat pump shuts down and goes into
operation automatically when the
pressure rises above 0.4 bar
One or two phases are missing
One or more lines missing.
Incorrect direction of rotation,
correct the comp. phase sequence
Phase sequence incorrect.
Error pressure sensor
Refrigerant circuit
Short circuit in pressure sensor
Operating instructions geoTHERM 0020051578_03
Emergency
mode
possible
_
possible
possible
possible
_
possible
_
possible
possible
possible
possible