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Cause Remedy
Fault on the outdoor unit Follow the instructions on the display. The outdoor
unit is locked.
If the message appears repeatedly:
Proceed as described on page 47. Notify your con-
tractor.
Note
If your system is operated for a long period with the
outdoor unit blocked, then room heating and DHW
heating can be provided entirely by the instantaneous
heating water heater. Turn emergency mode on for
this purpose: See page 37.
This will incur higher energy costs than in heat pump
mode.
If an external heat generator is connected, this will
take over all of the room heating.
!Please note
Escaping refrigerant will cause environmental
pollution.
Do not reset the outdoor unit multiple times in
quick succession.
Please notify your contractor.
"External hook-up" is displayed
Cause Remedy
The operating program set on the programming unit
has been changed over by an external device.
No action required
"Service" is displayed
Cause Remedy
The time for a service as specified by your contractor
has arrived.
Proceed as described on page 46.
"Panel locked" is displayed
Cause Remedy
The control panel is locked. Unlock it: See page 38.
What to do if...
"Outdoor unit locked" is displayed
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