Vaillant geoTHERM SERIES, Operating Instructions Manual

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