Rooms Are Too Hot; There Is No Hot Water - Viessmann VITOLIGNO 300-P Operating Instructions Manual

What to do if...

Rooms are too hot

Cause
Control unit incorrectly adjusted
Control unit fault or outside temperature
sensor/boiler water temperature sensor
faulty:
"Fault" is displayed and the red fault
indicator flashes (see page 47)
In conjunction with the mixer circuit: Mixer
motor faulty

There is no hot water

Cause
Heating system in "Standby"
ON indicator (green) flashes
or
Heating system is OFF,
ON indicator (green) is OFF
Control unit incorrectly adjusted
50
Remedy
Check and correct settings if required:
■ The heating circuit must be switched
ON (see page 17)
■ Room temperature (see page 17)
■ Time (see page 38)
■ Boiler heating characteristics (see
page 39)
Check the type of fault (see page 48) and
notify your local heating contractor.
Unlock motor lever A and manually
adjust mixer lever B (e.g. to "5").
Contact your local heating contractor.
Remedy
■ Press f (see page 11).
■ Switch ON the power supply, e.g. at a
separate MCB/fuse or a main isolator
(outside of the boiler room).
■ Check the MCB/fuse in the power
distribution board (main domestic
MCB/fuse).
Check and correct settings if required:
■ DHW heating must be switched ON
(see page 27)
■ DHW temperature (see page 28)
■ Time (see page 38)