There Is No Hot Water - Viessmann Vitodens 100-W Operating Instructions Manual

What to do if...

There is no hot water

Cause
The heating system is switched off.
Control unit is not set correctly.
No fuel.
" " is shown on the display.
" " and the fault code flash on the display. The burner
does not start.
The DHW is too hot
Cause
The control unit is not set correctly.
" " and the fault code are flashing
Cause
The burner does not start.
" " is shown
Cause
Heating system fault
34
Remedy
Turn on the ON/OFF switch.
■
Switch ON the mains isolator if installed (outside the
■
boiler room).
Reset the MCB in the power distribution board (main
■
domestic MCB).
Check and correct the DHW temperature.
With LPG:
Check the fuel reserves and re-order if required.
With natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
Notify your heating contractor of the fault code shown.
Reset the burner fault: See page 30.
Notify your heating contractor if the fault recurs.
Danger
If faults are not rectified, they can have life
threatening consequences.
Do not reset the burner fault several times in
quick succession. Notify your heating contractor
if a fault recurs. Your heating contractor will be
able to analyse the cause and rectify the fault.
Remedy
Check and correct the DHW temperature.
Remedy
Reset the burner fault: See page 30.
Notify your heating contractor if the fault recurs.
Danger
If faults are not rectified, they can have life
threatening consequences.
Do not reset the burner fault several times in
quick succession. Notify your heating contractor
if a fault recurs. Your heating contractor will be
able to analyse the cause and rectify the fault.
Remedy
Notify your heating contractor of the fault code.