Installation instructions for geoTHERM exclusive VWS 0020051614_00
78
Fault
code
Error text/description
Emergency
mode
Possible cause
Solution
91
Brine pressure too low
Pressure <0.2 bar
Heat pump shuts down and
goes into operation automat-
ically when the pressure
rises above 0.4 bar
possible
Pressure drop in the heat source
system as a result of leakage or air
lock.
Check heat source system for leaks, top up
brine, bleed.
Brine pressure sensor defective.
Check the plug contact on the PCB and the
cable harness, check pressure sensor for
correct functioning, replace pressure sen-
sor.
L1 and N connections on the PCB in-
terchanged.
Check L1 and N connections on the PCB
and connect correctly if necessary.
96
Error - sensor fault
short-circuit in the pressure
sensor
possible
A pressure sensor in the cooling cir-
cuit is defective or not properly
plugged in.
Check the plug contact on the PCB and the
cable harness, check pressure sensor for
correct functioning, replace pressure sen-
sor.
97
No power for compressor
possible
Start-up current limiter defective or
incorrectly connected.
Check start-up current limiter
Table 10.4 Fault-induced shutdown (ctnd.)
10.6 Other
errors/malfunctions
Malfunction sign
Possible cause
Solution
The auxiliary heating does not function,
even though it has been enabled by the con-
troller (e.g. when the supply has been
blocked by the power supply company
(Power company blockage)); the heating or
the domestic hot water cylinder do not
reach the desired temperature.
The auxiliary heating is tied to a low-rate
tariff which has been blocked by the power
company.
Check whether the auxiliary heating is on a
low-rate tariff and a power company block-
age is in effect.
The safety thermostat (STB) on the auxiliary
heating has tripped.
Release the STB by pushing the button.
Possible causes if the thermostat trips again:
Air in the heating system. Blocked dirt filters
in the heating system return line.
Bleeding heating circuit. Clean the blocked
dirt filters.
The heating circulation pump has stopped or
is running too slowly.
check the heating circulation pump and re-
place if necessary.
Noise in the heating circuit.
Air in the heating circuit.
Bleeding heating circuit.
Dirt in the heating circuit.
Flush the heating circuit.
"Out T. aux htr on" incorrectly set.
Change "Out T. aux htr on" (Menu A3).
Faulty pump.
Check functioning of the pump; replace if
necessary.
Traces of water beneath or next to the ap-
pliance.
The condensate drain is blocked.
Condensate in the interior of the unit is col-
lected in the condensate pan and, if neces-
sary, fed away under the unit (not a fault).
Check the insulation on the pipes in the inte-
rior of the unit and re-insulate, if necessary,
to reduce the accumulation of condensate.
Leaks from the heating circuit.
Check the heating circuit components
(pump, auxiliary heating, pipes) for leaks.
If necessary, retighten the screw couplings
and replace the seals.
Outside temperature indicates -60 ºC.
Outside temperature sensor defective.
Check outside temperature sensor.
Temperatures in the heating circuit too cold
or too warm.
Room target temp. not optimally set
Change room target temp. (Menu
1).
Set-back temp. not optimally set
Change set-back temp. (Menu 1).
Heating curve not optimally set.
Change heating curve (Menu C2).
Table 10.5 Other errors/malfunctions
10 Troubleshooting and diagnosis
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