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Troubleshooting
Cause Remedy
The heating system is switched off.
■
Switch ON the mains isolator, if installed (outside the boiler room).
■
Switch ON the MCB in the power distribution board (main domestic MCB).
Control unit or room temperature controller
is incorrectly set.
■
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).
Only when operating with DHW heating:
DHW priority is enabled (
is displayed).
Wait until the DHW cylinder has been heated up (
disappears).
"Fault" is shown on the display. Notify your heating contractor of the fault code shown.
(Press the rotary selector to view a description of the fault)
Air in the heating system. Bleed radiators.
Rooms are too cold
Cause Remedy
Control unit or room temperature controller
is incorrectly set.
Check and correct the room temperature or boiler water temperature
Operating instructions
Room temperature controller
"Fault" is shown on the display. Notify your heating contractor of the fault code shown.
(Press the rotary selector to view a description of the fault)
Rooms are too hot
Cause Remedy
The heating system is switched off.
■
Switch ON the mains isolator, if installed (outside the boiler room).
■
Switch ON the MCB in the power distribution board (main domestic MCB).
Control unit is incorrectly set. Check and correct the DHW temperature
(see page 12 for VMN3 or page 20 for VLN3)
"Fault" is shown on the display. Notify your heating contractor of the fault code shown.
(Press the rotary selector to view a description of the fault)
No DHW installed
Cause Remedy
Control unit is incorrectly set. Check and correct the DHW temperature
(see page 12 for VMN3 or page 20 for VLN3)
DHW is too hot
Cause Remedy
Heating system fault Inform your heating contractor of the fault code.
"Fault" is shown on the display
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