"Fault" Is Displayed; Ë And "Service" Are Displayed; "External Hook-Up" Is Displayed - Viessmann VITODENS 200-W Operating Instructions For The System User

What to do if...

"Fault" is displayed

Cause
System fault
and "Service" are displayed
ë
Cause
The time for a service as specified by your contractor
has arrived.
"Panel locked" is displayed
Cause
The control panel is locked.

"External hook-up" is displayed

Cause
The set operating program was changed over by an ex-
ternal device, e.g. an EM-EA1 extension (DIO electron-
ics module): See page 18.
50
Remedy
Proceed as described on page 43.
Remedy
Proceed as described on page 42.
Remedy
Unlock it: See page 35.
Remedy
No action required.
Once the external changeover no longer applies, the
set operating program is switched on again.