Fault diagnosis and rectification
104
Installation instructions geoTHERM 0020051574_04
11
Fault code
Error text/description
Emergency
mode
Possible cause
Solution
52
Sensors do not match the
hydraulic scheme
_
Hydraulics diagram incorrectly
inputted. Sensors not connected
correctly.
>
Check the hydraulics diagram and
sensor positions based on the existing
heating system.
60
Heat source frost protect
monitoring source outlet
Error 20 has occurred
three times in a row
possible
See Error 20.
See Error 20.
61
(VWW only)
Heat source frost protect
monitoring source outlet
Fault 21 has occurred
three times in succession.
possible
See Error 21.
See Error 21.
62
(VWS only)
Heat source frost protect
monitoring source outlet
Error 22 has occurred
three times in a row
possible
See Error 22.
See Error 22.
63
(VWW only)
No ground water flow
Fault 23 has occurred
three times in succession.
possible
See Error 23.
See Error 23.
72
Flow temperature too high
for underfloor heating
Flow temperature higher
than set value for 15 min.
(max. CH tempe
compressor hyst
2 K)
¬
Ch.
9.8
,, factory
setting: 52 °C).
_
Flow sensor VF2 fitted too close
to the heat pump.
>
Change the position of the flow sen-
sor according to the hydraulics dia-
gram.
Flow sensor VF2 is faulty
>
Check flow sensor VF2, replace if nec-
essary.
Pump output of the external
heating circuit pump has dropped
or pump is faulty.
>
Check the external heating circuit
pump, and replace if necessary.
Existing dirt strainers clogged or
incorrectly dimensioned.
>
Clean dirt strainers.
Mixer behind buffer tank is faulty.
>
Test mixer, replace if necessary.
Max. CH temperature set too low.
>
Check "Max. CH temp." setting.
81
Coolant pressure too high
Error 27 has occurred
three times in a row
possible
See Error 27.
See Error 27.
83
Coolant pressure too low.
Check heat source
Fault 28 has occurred
three times in succession
possible
See Error 28.
See Error 28.
11.4 Fault with permanent switch-off
