35
Cause
Remedy
Heating system fault
Proceed as described on page 31.
ë
flashes and "Service" is displayed
Cause
Remedy
The time for a service, as specified by your heating
contractor, has arrived.
Proceed as described on page 29.
"Controls locked out" is displayed
Cause
Remedy
Control was blocked by your heating contractor.
Your heating contractor can lift this block.
"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
"External program" is displayed
Cause
Remedy
The operating program set at the control unit has been
switched over by a communication interface.
You can change the operating program.
What to do if...
ã
flashes and "Fault" is displayed
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