50
Installation and maintenance instructions 0020213394_05
Status code
Explanation/indicator in the heat pump
display
S.240
Compr. oil temp. too low, environment
too cold
Displays relating to the auxiliary electric heating circuit
S.350
Immersion heater: Safety cut-out open
S.351
Immersion heater: Flow temp. too high
S.352
Immersion heater: Pressure too low
S.353
Immersion heater: Flow rate too low
S.354
Immersion heater: Phase failure
I
Maintenance messages
Code
Meaning
Cause
Remedy
M.32
Building circuit: Pressure low
–
Pressure loss in the building circuit
due to leakages or air pockets
–
Building circuit pressure sensor is
defective
–
Check the building circuit for leaks,
top up with heating water and purge
–
Check the plug contact on the PCB
and on the cable harness; check
that the pressure sensor is working
correctly and, if required, replace the
pressure sensor
M.33
Only with
the heat
source:
Air
Fan unit: Cleaning required
–
Air inlet or air outlet of the air-to-
brine heat exchanger contaminated
–
Heat transfer from the air to the brine
heat transfer medium is too low
–
Brine pipes inverted
–
Air in the environment circuit
–
Defective de-icer
–
Fan noise reduction mode activated
–
The fan unit is de-iced more fre-
quently than is required. The effi-
ciency of the heat pump is reduced.
Loosen and clean any dirt from the
fan unit (air-to-brine heat exchanger)
–
Check that the connections are
correctly assigned to the brine lines
–
Purge the environment circuit
–
Check de-icer (sensor/actuator test?)
–
Reduce noise reduction mode
–
Completely deactivate fan noise
reduction mode
M.34
Environment circuit: Pressure low
–
Pressure loss in the environment
circuit due to leakages or air pockets
–
Environment circuit pressure sensor
defective
–
Check the environment circuit for
leaks, top up with medium (brine-to-
water), and purge
–
Check the plug contact on the PCB
and on the cable harness; check
that the pressure sensor is working
correctly and, if required, replace the
pressure sensor
M.49
Only with
the heat
source:
Air
Environment circuit: Brine lines
inverted
–
Check that the connections are
correctly assigned to the brine lines
J
Fault codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
Note
In the rare event of faults which are caused by components in the refrigerant circuit, inform customer service.
Code
Meaning
Cause
Remedy
F.070
Fault: Invalid Device Specific
Number
–
Replacing the control PCB and
display PCB
–
Setting the correct Device Specific
Number
