Troubleshooting Rooms Are Too Cold; Rooms Are Too Hot; No Dhw Installed; Dhw Is Too Hot - Viessmann Vitotron 100 Operating Instructions For The System User

Troubleshooting
Rooms are too cold
Cause
The heating system is switched off.
Control unit or room temperature controller
is incorrectly set.
Only when operating with DHW heating:
DHW priority is enabled (

"Fault" is shown on the display.

Air in the heating system.

Rooms are too hot

Cause
Control unit or room temperature controller
is incorrectly set.
"Fault" is shown on the display.

No DHW installed

Cause
The heating system is switched off.
Control unit is incorrectly set.
"Fault" is shown on the display.

DHW is too hot

Cause
Control unit is incorrectly set.
"Fault" is shown on the display
Cause
Heating system fault
26
Remedy
■ Switch ON the mains isolator, if installed (outside the boiler room).
■ Switch ON the MCB in the power distribution board (main domestic MCB).
■ Operation with room temperature controller VLN3:
Setting a higher boiler water temperature (See page 20).
■ Weather-compensated operation of the VMN3:
Setting a higher room temperature (See page 12).
Wait until the DHW cylinder has been heated up (
is displayed).
Notify your heating contractor of the fault code shown.
(Press the rotary selector to view a description of the fault)
Bleed radiators.
Remedy
Check and correct the room temperature or boiler water temperature
Operating instructions
Room temperature controller
Notify your heating contractor of the fault code shown.
(Press the rotary selector to view a description of the fault)
Remedy
■ Switch ON the mains isolator, if installed (outside the boiler room).
■ Switch ON the MCB in the power distribution board (main domestic MCB).
Check and correct the DHW temperature
(see page 12 for VMN3 or page 20 for VLN3)
Notify your heating contractor of the fault code shown.
(Press the rotary selector to view a description of the fault)
Remedy
Check and correct the DHW temperature
(see page 12 for VMN3 or page 20 for VLN3)
Remedy
Inform your heating contractor of the fault code.
disappears).