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

What to do if...

Rooms are too cold

Cause
Central heating is switched off.
Control unit incorrectly set.
■
The remote control (if installed) is set incorrectly.
■
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.
■
The remote control (if installed) is set incorrectly.
■
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
44
Remedy
Check the room thermostats. If necessary, change the
operating program.
Check the settings and correct if required:
The heating circuit must be on. See page 18.
■
Room temperature: See page 17.
■
Time: See page 36.
■
Switching times: See page 18.
■
Check the type of fault and notify your heating contrac-
tor accordingly. See page 41.
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 on. See page 18.
■
Room temperature: See page 17.
■
Time: See page 36.
■
Switching times: See page 18.
■
Check the type of fault and notify your heating contrac-
tor accordingly. See page 41.
Unhook motorised lever
ually (e.g. to "5").
Notify your heating contractor.
. Adjust mixer lever
A B
. Adjust mixer lever
A B
man-
man-