47
Cause Remedy
The time for a service as specified by your contractor
has arrived.
Proceed as described on page 37.
"External hook-up" is displayed
Cause Remedy
The operating program set at the control unit was e.g.
changed over via an externally connected button.
Example: In a school, heating demand exists outside of
school times, e.g. for a parents’ evening.
No action required. This function cannot be influenced
via the control unit. 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
changed by another control device.
You can change the operating program.
What to do if...
ë and "Service" are displayed
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