Rooms Are Too Cold; Rooms Are Too Hot - Viessmann VITOLIGNO 300-C Operating Instructions Manual

What to do if...

Rooms are too cold

Cause
Central heating is off.
Control unit incorrectly set.
Control unit fault:
"Fault" is displayed and the red fault indicator flashes
The heating circuit pump is not working.
Heating circuit with mixer: mixer motor faulty

Rooms are too hot

Cause
Control unit incorrectly set.
Control unit fault or outside temperature sensor/boiler
water temperature sensor faulty:
"Fault" will be displayed; the red fault indicator flashes.
Heating circuit with mixer: mixer motor faulty
42
Remedy
Check the settings and correct if required:
The heating circuit must be ON (see page 17)
■
Room temperature (see page 16)
■
Time (see page 35)
■
Switching times (see page 17)
■
Check the type of fault (see page 38) and notify your
heating contractor.
Contact your heating contractor.
Unhook motorised lever
lever B (to "5" for example).
Notify your heating contractor.
Remedy
Check the settings and correct if required:
The heating circuit must be ON. See page 17
■
Room temperature (see page 16)
■
Time (see page 35)
■
Switching times (see page 17)
■
Check the type of fault (see page 38) and notify your
heating contractor.
Unhook motorised lever
lever (to "5" for example).
B
Notify your heating contractor.
A and manually adjust mixer
and manually adjust mixer
A