77
geoTHERM exclusive VWS 0020051614_00 installation instructions
Fault
code
Error text/description
Emergency
mode
Possible cause
Solution
60
Frost protection heat source
monitoring source outlet
Error 20 has occurred three
times in a row
possible
See Error 20.
See Error 20.
62
Frost protection heat source
monitoring source outlet
Error 22 has occurred three
times in a row
possible
See Error 22.
See Error 22.
72
Flow temperature too high
for underfloor heating
Flow temperature is higher
than a preset value for
15 min (max. HK temp. +
compr.hyst 2 K)
(see Chap. 8.10, default set-
ting: 52 °C) .
_
Flow sensor VF2 fitted too close to the
heat pump.
Relocate flow sensor in accordance with
hydraulic plan.
Flow sensor VF2 is defective
Check flow sensor VF2, replace if neces-
sary.
Defective heating circulation pump or
pump output has reduced.
Test heating circulation pump, replace if
necessary.
Existing dirt strainers clogged or incor-
rectly dimensioned.
Clean dirt strainers.
Mixer behind buffer cylinder is defec-
tive.
Test mixer, replace if necessary.
Max. HK temp. set too low.
Check "Max. HK 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
Error 28 has occurred three
times in a row
possible
See Error 28.
See Error 28.
84
Coolant pressure outside
the range
Error 29 has occurred three
times in a row
possible
See Error 29.
See Error 29.
90
Heating system pressure
too low
Pressure <0.5 bar
Heat pump shuts down and
goes into operation auto-
matically when the pressure
rises above 0.7 bar
_
Pressure drop in the heating system as
a result of leakage, air lock or defec-
tive expansion vessel.
Check heating system for leaks, top up
water, bleed, check the expansion vessel.
Screw couplings at the rear of the heat
pump are not sealing correctly .
Retighten screw couplings.
Compression fittings on 3-way valve
are leaking.
Retighten compression fittings on 3-way
valve.
Table 10.4 Fault-induced shutdown (ctnd.)
Troubleshooting and diagnosis 10
Summary of Contents for geoTHERM exclusive
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