Fault diagnosis and rectification
106 Installation instructions geoTHERM 0020051574_04
11
Fault code Error text/description
Emergency
mode
Possible cause Solution
94 Phase loss. Check fuse
One or more phases have
failed
possible Loss of a phase or a fuse has
tripped.
> Check fuses and cable connections
(power supply to the compressor).
Badly tightened electrical con-
nections.
> Check electrical connections.
Mains voltage too low. > Measure voltage at heat pump termi-
nal box.
Energy supply company switch-
off to incorrectly set electric wir-
ing diagram (e. g. Electric Wiring
Diagram 1).
> Check the setting of the wiring dia-
gram.
In-rush current limiter faulty or
incorrectly connected.
> Check the in-rush current limiter and
inform the factory customer service
department if necessary.
95 Incorrect compressor
direction of rotation
Correct the phase
sequence
Phase sequence incorrect
possible No voltage (temporary switch-off
by energy supply company)
> Connect the contact of the ripple con-
trol receiver to terminal 13.
Phases switched over. > Change the phase sequence by
switching over 2 phases at a time on
the mains feed.
In-rush current limiter faulty or
incorrectly connected.
> Check the in-rush current limiter and
inform the factory customer service
department if necessary.
96 Coolant circuit pressure
sensor fault
short-circuit in the pres-
sure sensor
possible A pressure sensor in the coolant
circuit is faulty or not properly
plugged in.
> Check the quality of plug contact on
the circuit board and on the cable har-
ness.
> Check the pressure sensor for correct
operation.
> Replace the pressure sensor.
11.4 Fault with permanent switch-off
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