The Dhw Is Too Hot; U" Flashes On The Display; U" Is Shown On The Display; Fault Code "58" Is Shown On The Display - Viessmann VITODENS 100-W Operating Instructions Manual

The DHW is too hot

Cause
The control unit is incorrectly adjusted.

"U" flashes on the display

Cause
The burner does not start.

"U" is shown on the display

Cause
Heating system fault.

Fault code "58" is shown on the display

Cause
No DHW cylinder is connected and rotary
selector "tw" is not set to "0".
Remedy
Check and correct the DHW temperature
(see page 13).
Remedy
Reset the burner fault (see page 20).
Remedy
Notify your heating contractor of the fault
code.
Remedy
Turn rotary selector "tw" to "0".
What to do if...
19