What To Do If; Rooms Are Too Cold - Viessmann VITOLIGNO 300-P Operating Instructions Manual

Rooms are too cold

Cause
Heating system in "Standby"
ON indicator (green) flashes
or
The heating system is switched OFF,
ON indicator (green) is OFF
Control unit incorrectly adjusted
Only when operating with a DHW
cylinder:
DHW priority
No fuel
Control unit fault:
"Fault" is displayed and the red fault
indicator flashes (see page 47)
In conjunction with the mixer circuit: Mixer
motor faulty
Remedy
■ Press f (see page 11).
■ Switch ON the power supply, e.g. at a
separate MCB/fuse or a main isolator
(outside the boiler room).
■ Check the MCB/fuse in the power
distribution board (main domestic
MCB/fuse).
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)
Wait until the DHW cylinder has been
heated up.
Check the fuel reserves and re-order, if
required.
Check the set delivery times. Select the
delivery times in such a way that there is
sufficient fuel should the power fail
temporarily.
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.

What to do if...

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