De-icing
Unit
Fault code
Category
Unit
Alarm description
Troubleshooting
(See appendix 1: "Simplified diagrams" for the positioning of damp-
ers, sensors, air directions, etc.)
xx
yy
z
32
03
1
De-
Ice
De-icing activated be-
cause of icing
Information showing the unit running de-icing
32
04
1
Standby mode activa-
ted because of too
much icing
Information showing the unit is in hibernation mode because
of too much icing
32
05
4
De-icing failed
Total number of restarts after hibernation set in Menu 7.4 is
exceeded
●
Check if outdoor air temperature is still too low. If so,
operation can only start again when the temperature
has risen
32
06
3
Illegal de-icing method
●
Select correct de-icing method in accordance with sec-
tion "De-icing methods"
32
07
2
Bypass de-icing is de-
activated
iHCW: The return water temperature has fallen below the
warning temperature and the frost protection function is ac-
tive.
●
Check that the hot water supply to the heating coil is
functioning
If the hot water supply is functioning, check if the motor valve
opens and the circulation pump is running.
●
Check by turning the unit to "OFF" in the user menu and
force start the motor valve and any circulation pump in
specialist menu 8.3
The alarm resets automatically when the temperature rises
above the heat retention level
Damper
Unit
Fault code
Category
Unit
Alarm description
Troubleshooting
(See appendix 1: "Simplified diagrams" for the positioning of
dampers, sensors, air directions, etc.)
xx
yy
z
33
01
2
Damper
BP1:
Bypass damper 1
faulty
BP1:
●
Check the damper operates freely. Depress the re-
lease on the damper motor and rotate the damper.
●
Go to forced start in menu 8.3 and force the closed
damper to open
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Alarms
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