Flashes And "Service" Is Displayed - Viessmann Vitodens 200-W B2HA series Operating Instructions Manual

Troubleshooting

Flashes and "Service" is Displayed

" "
Cause
The time for a service, as specified by your heating
contractor, has arrived.
"Controls Locked Out" is Displayed
Cause
This function is blocked.
"External Hook-up" is Displayed
Cause
The heating program set at the control unit was changed
by an external device, e.g. extension EA1.
"External Program" is Displayed
Cause
The heating program set at the control unit was changed
by the Vitocom communication interface
34
Vitodens 200 Series 19 to 150 Operating
Remedy
Proceed as described on page 29.
Remedy
Your heating contractor can lift this block.
Remedy
No remedy is required.
Remedy
You can change the heating program.