Temporary Malfunctions; Blocking Error - Vaillant geoTHERM VWS Serie Instrucciones De Uso

5 Operation

5.12.5 Temporary malfunctions

The heat pump is shut down temporarily and starts
up again independently when the cause of the fault is
removed.
Depending on the error the heat pump switches back on
automatically after 5 or 60 minutes.
Take note of the error code and text and discuss this
during the next inspection with the expert technician.
Fault code Error text/description
20 Frost protection heat source monitoring source
outlet
Temperature difference of the heat source > set
value "permitted temp. difference"
This error message is deactivated as standard and
can only be activated via vrDIALOG parameter
"permitted temp. difference" (20 K difference
means deactivated).
21 Frost protection heat source over. source outlet
(only VWW)
Source outlet temperature too low (<4 ºC)
22 Frost protection heat source over. source outlet
(only VWS)
Source outlet temperature too low
(<parameter freezing protection in menu A4)
23 No ground water flow
(only VWW)
Integrated flow switch does not detect any volume
flow
27 Coolant pressure too high
The integrated high pressure switch tripped at
30 bar (g).
The heat pump cannot be restarted until after
60 min. at the earliest.
28 Coolant pressure too low
The integrated low pressure switch tripped at
1.25 bar (g).
29 Coolant pressure outside the range
If the error occurs twice in a row the heat pump
cannot be started until after 60 min. at the earliest.
Table 5.6 Temporary malfunctions
26
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5.12.6 Blocking error

Errors could occur which result in the shutdown of the
heat pump.
Table 5.7 Error shutdown
Fault code Error text/description
32 Error heat source sensor T8
Short-circuit in the sensor
33 Error heat circuit pressure sensor
short-circuit in the pressure sensor
34 Error brine pressure sensor
short-circuit in the pressure sensor
40 Error comp outlet sensor T1
Short-circuit in the sensor
41 Error heat source sensor T3
Short-circuit in the sensor
42 Error HP return sensor T5
Short-circuit in the sensor
43 Error HP flow sensor T6
Short-circuit in the sensor
44 Error external sensor AF
Short-circuit in the sensor
45 Error DHW tank sensor SP
Short-circuit in the sensor
46 Error HB flow sensor VF1
Short-circuit in the sensor
47 Error HB return sensor RF1
Short-circuit in the sensor
48 Error flow sensor VF2
Short-circuit in the sensor
52 Sensors are not suited to the hydrau-
lic plan
60 Frost protection heat source moni-
toring source outlet
Error 20 has occurred three times
in a row
61 Frost protection heat source moni-
only VWW toring source outlet
Error 21 has occurred three times in
a row
62 Frost protection heat source moni-
only VWS toring source outlet
Error 22 has occurred three times in
a row
Operating Manual geoTHERM VWS/VWW 0020051578_01
Emergency
mode
possible
possible
possible
possible
possible
possible
possible
possible
possible
possible
WW operation
possible
_
possible
possible
possible