Controls Locked Out" Is Displayed - Viessmann VITODENS Operating Instructions Manual

What to do if...
flashes and "Fault" is displayed
ã
Cause
Heating system fault
flashes and "Service" is displayed
ë
Cause
The time for a service, as specified by your heating
contractor, has arrived.

"Controls locked out" is displayed

Cause
Control was blocked by your heating contractor.
"External hook-up" is displayed
Cause
The operating program set at the control unit was
changed by an external device, e.g. EA1 extension.
"External program" is displayed
Cause
The operating program set at the control unit was
changed over by the Vitocom communication interface.
34
Remedy
Proceed as described on page 29.
Remedy
Proceed as described on page 28.
Remedy
Your heating contractor can lift this block.
Remedy
No measures required
Remedy
You can change the operating program.