Activating Emergency Mode; Errors/Malfunctions That You Can Remedy; Warning Messages; Temporary Malfunctions - Vaillant geoTHERM VWS 61/2 Operating Manual

5.10.2 Activating emergency mode

Depending on the type of malfunction the expert techni-
cian can set the heat pump to continue operation in
emergency mode (via an integrated electric auxiliary
heating) until the cause of the error is remedied, and ei-
ther for heating operation (display "heating priority"),
for hot water operation (display "hot water priority") or
for both (display "heating priority/hot water priority"),
see the following tables, column "emergency operation".

5.10.3 Errors/malfunctions that you can remedy

Malfunction sign Possible cause
Noise in the heating cir- Dirt in the heating
cuit. circuit.
Faulty pump.
Air in the heating
circuit.
Table 5.4 Other malfunctions

5.10.4 Warning messages

The following warning messages do not cause a mal-
function in the operation of the heat pump. The heat
pump is not shut down.
Take note of the error code and text and discuss this
during the next inspection with the expert technician.
Fault code Error text/description
26 Overheating on compressor pressure side
36 Low brine pressure
Table 5.5 Warning messages, no shutdown
Operating Manual geoTHERM VWS/VWW 0020051547_02

5.10.5 Temporary malfunctions

The heat pump is shut down temporarily and starts up
again independently when the cause of the fault is re-
moved.
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
20
Solution
Bleeding heating cir-
cuit.
21
(only VWW)
22
(only VWS)
23
(only VWW)
27
28
29
Table 5.6 Temporary malfunctions
Operation 5
Error text/description
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).
Frost protection heat source over. source outlet
Source outlet temperature too low (<4 ºC)
Frost protection heat source over. source outlet
Source outlet temperature too low
(<parameter freezing protection in menu A4)
No ground water flow
Integrated flow switch does not detect any volume
flow
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.
Coolant pressure too low
The integrated low pressure switch tripped at
1.25 bar (g).
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.
GB 25