Rooms Are Too Cold; Rooms Are Too Hot - Viessmann VITOLIGNO 300-C Operating Instructions For The System User

Rooms are too cold

Cause
Central heating is switched off.
Control unit incorrectly set.
Control unit fault:
"Fault" is shown in the display. 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" is shown in the display. The red fault indicator
flashes.
Heating circuit with mixer: Mixer motor faulty
Remedy
Check the room thermostats. If necessary, change the
operating program.
Check the settings and correct if required:
The heating circuit must be switched on (see
■
page 18)
Room temperature (see page 18)
■
Time (see page 36)
■
Switching times (see page 19)
■
Check the type of fault (see page 40) and notify your
heating contractor.
Contact your heating contractor.
Unhook motorised lever
ually (e.g. to "5").
Notify your heating contractor.
Remedy
Check the settings and correct if required:
The heating circuit must be switched on (see
■
page 18)
Room temperature (see page 18)
■
Time (see page 36)
■
Switching times (see page 19)
■
Check the type of fault (see page 40) and notify your
heating contractor.
Unhook motorised lever
ually (e.g. to "5").
Notify your heating contractor.
What to do if...
. Adjust mixer lever
A B
. Adjust mixer lever
A B
man-
man-
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