50
Cause Remedy
The control unit is set incorrectly. Check and correct the DHW temperature if required
(see page 35).
The DHW is being heated by the solar thermal system. Check the settings at the solar control unit and correct
them if required.
Separate operating instructions
"Fault" is displayed
Cause Remedy
Heating system fault Proceed as described on page 45.
ë and "Service" are displayed
Cause Remedy
The service time, as specified by your heating contrac-
tor, has arrived.
Proceed as described on page 45.
"Operation disabled" is displayed
Cause Remedy
The controls have been locked. Unlock them (see page 41).
"External hook-up" is displayed
Cause Remedy
The operating program set at the control unit has been
switched over by an external device, e.g. EA1 exten-
sion.
No action required. Once the external changeover no
longer applies, the set operating program becomes ac-
tive again.
"External program" is displayed
Cause Remedy
The operating program set at the control unit has been
switched over by the Vitocom communication interface.
You can change the operating program.
"Check filter" is displayed
Cause Remedy
■
The filters in your ventilation unit and in your exhaust
air valves are severely contaminated.
■
The last filter change was more than 1 year ago.
Change the filters (see page 53).
What to do if...
The DHW is too hot
5811580
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