Appendix
0020291573_00 Heat pump control interface module Installation instructions 29
Statuscode Meaning
S.284 De-icing flow temperat-
ure too low
If the flow temperature is below 5 °C, the heat pump is restarted. If the flow temperature is still not
sufficient after three unsuccessful restarts, the heat pump is switched off and the fault message F.741
is displayed. ► Check whether sufficient thermal energy is available from the building circuit.
S.285 Compressor outlet tem-
perature too low
Compressor outlet temperature is too low
S.286 Hot gas temperature
switch open
If the hot gas temperature is above 119 °C +5 K, the heat pump is switched off for one hour and then
restarted again. If the hot gas temperature has not fallen after three unsuccessful restarts, the heat
pump is switched off and the fault message F.823 is displayed.
S.287 Fan 1: Wind Before starting, the fan rotates at a speed of 50 rpm or higher. This may be caused by a strong out-
side wind.
S.288 Fan 2: Wind Before starting, the fan rotates at a speed of 50 rpm or higher. This may be caused by a strong out-
side wind.
S.289 Current limit active The outdoor unit's power consumption is reduced, the compressor speed is reduced. The com-
pressor's operating current exceeds the limit value that is set under the configuration. (for 3 kW,
5 kW, 7 kW units: <16 A; for 10 kW, 12 kW units: <25 A)
S.290 Switch-on delay active The compressor's switch-on delay is active.
S.302 High-pressure switch
open
If the pressure in the refrigerant circuit exceeds the operating limit, the heat pump is switched off for
15 minutes and is then restarted again. If the pressure remains too high after four unsuccessful re-
starts, the fault message F.731 is displayed.
S.303 Compressor outlet tem-
perature too high
The operating characteristics have been exited. The heat pump is restarted.
S.304 Evaporation temperat-
ure too low
The operating characteristics have been exited. The heat pump is restarted.
S.305 Condensation temperat-
ure too low
The operating characteristics have been exited. The heat pump is restarted.
S.306 Evaporation temperat-
ure too high
The operating characteristics have been exited. The heat pump is restarted.
S.308 Condensation temperat-
ure too high
The operating characteristics have been exited. The heat pump is restarted.
S.312 Building circuit: Return
temperature too low
Return temperature in the building circuit too low for compressor to start. Heating: Return temperature
< 5 °C. Cooling: Return temperature < 10 °C. Cooling: Check that the 4-port diverter valve works cor-
rectly.
S.314 Building circuit: Return
temperature too high
Return temperature in the building circuit too high for the compressor to start. Heating: Return tem-
perature > 56 °C. Cooling: Return temperature > 35 °C. Cooling: Check that the 4-port diverter valve
works correctly. Check the sensors.
S.516 De-icing mode active The heat pump de-ices the outdoor unit's heat exchanger. The heating mode is interrupted. The max-
imum de-icing time is 16 minutes.
S.575 Frequency converter:
Internal fault
An internal electronics fault is present on the outdoor unit's inverter PCB. If this occurs three times,
fault message F.752 appears.
S.581 Connection fault: Fre-
quency converter not recog-
nised
Missing communication between the frequency converter and the outdoor unit's PCB. After this oc-
curs three times, fault message F.753 appears.
S.590 Fault: 4-port valve posi-
tion not correct
The 4-port diverter valve does not move fully to the heating or cooling position.
E 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.201 Sensor fault: Cylinder temperature – Cylinder temperature sensor defect-
ive
– Check the plug contact on the PCB
and on the cable harness; check that
the sensor is working correctly and,
if required, replace the sensor
M.202 Sensor fault: System temperature – System temperature sensor defective – Check the plug contact on the PCB
and on the cable harness; check that
the sensor is working correctly and,
if required, replace the sensor
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