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Code
S.727 High-pressure monitor-
ing triggered in the refriger-
ant circuit
S.728 Low-pressure monitor-
ing triggered in the refriger-
ant circuit
H
Maintenance codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question.
Status code
I.003
The maintenance time has been
reached.
I.023
External current anode signal
invalid
I.032
Building circuit water pressure
low
I.200
Low pressure in the decoupled
brine circuit (building circuit)
(validity: Systems with
decoupled brine circuit)
I.201
Signal for the cylinder temperat-
ure sensor is invalid
I.202
Signal for the system temperat-
ure sensor invalid
I.203
No communication between the
display and the main PCB
I
Reversible limp home mode codes
Note
Since the code table is used for various products, some codes may not be visible for the product in question. The
reversible L.XXX codes eliminate themselves. Check programmes ( P.XXX) and actuator tests (T.XXX) can tem-
porarily block L.XXX codes.
Code
L.283
L.284
L.302
L.504
L.718
8000017440_FT Installation and maintenance instructions
Meaning
High-pressure monitoring has triggered in the refrigerant circuit. The unit attempts a restart.
Low-pressure monitoring has triggered in the refrigerant circuit. The unit attempts a restart.
Possible cause
Maintenance interval elapsed
Input current anode defective
Pressure loss in the building
circuit due to leakages or air
pockets
Building circuit pressure sensor
is defective
Pressure loss in the building
circuit due to leakages or air
pockets
Building circuit pressure sensor
is defective
Cylinder temperature sensor
defective
System temperature sensor
defective
Display not connected
Display defective
Meaning
De-icing unsuccessful. The unit attempts to restart.
The flow temperature in the building circuit during de-icing is too low. The unit attempts to restart.
The high-pressure switch in the refrigerant circuit has been triggered.
The signal for fan 1 and/or the fan speed is invalid.
Fan 1 from the environment circuit is not rotating. The heat pump attempts to restart the fan.
Measure
1.
Carry out maintenance work.
2.
Reset the service interval.
1.
Check the cable for cable breaks.
2.
Replace the external current anode.
1.
Check the building circuit for leaks.
2.
Top up the heating water and purge.
1.
Check the quality of the plug contact on the PCB and on the
wiring harness.
2.
Check that the pressure sensor is working correctly.
3.
If required, replace the pressure sensor.
1.
Check the building circuit for leaks.
2.
Top up the heating water and purge.
1.
Check the quality of the plug contact on the PCB and on the
wiring harness.
2.
Check that the pressure sensor is working correctly.
3.
If required, replace the pressure sensor.
1.
Check the quality of the plug contact on the PCB and on the
wiring harness.
2.
Check that the sensor is working correctly.
3.
If required, replace the sensor.
1.
Check the quality of the plug contact on the PCB and on the
wiring harness.
2.
Check that the sensor is working correctly.
3.
If required, replace the sensor.
▶
Check the quality of the plug contact on the PCB and on the
wiring harness.
▶
Replace the display.
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