Rooms Are Too Hot; There Is No Dhw; The Dhw Is Too Hot - Viessmann vitotronic 300-k Operating Instructions Manual

Vitotronic 300-K Operating

Rooms are Too Hot

Cause
H Control unit incorrectly adjusted.
H The remote control (if installed) is set incorrectly.
Separate operating instructions
"Fault" is displayed. The red fault indicator flashes.
The mixer motor is faulty.
Emissions test switch is set to

There is No DHW

Cause
The heating system is off.
H Control unit incorrectly adjusted.
H The remote control (if installed) is set incorrectly.
Separate operating instructions
No fuel.
"Fault" is displayed. The red fault indicator flashes.

The DHW is Too Hot

Cause
Control unit incorrectly adjusted.
The DHW is being heated by the solar thermal system.
Emissions test switch is set to
.
.
Remedy
Check the settings and correct if required:
H Operating program (see page 13)
H Room temperature (see page 13)
H Time (see page 22)
H Time program, central heating (see page 14)
H Heating curve (see page 14)
Check what type of fault it is. Acknowledge the fault
(see page 26). Notify your heating contractor if necessary.
Adjust the mixer manually.
Close the flap.
Remedy
H Switch ON the ON/OFF switch on the control units
(see page 9).
H Switch ON the mains isolator, if installed
(outside the boiler room).
H Set the MCB in the power distribution board
(main domestic MCB).
DHW heating must be enabled.
Check the settings and correct if required:
H Operating program (see page 18)
H DHW temperature (see page 18)
H Time program DHW heating (see page 19)
H Time (see page 22)
With LPG:
Check the fuel reserves and re-order if required.
With natural gas:
Open the gas shut-off valve.
If necessary, check with your gas supply utility.
Check what type of fault it is. Acknowledge the fault
(see page 26).
Notify your heating contractor if necessary.
Remedy
Check and correct the DHW temperature, if required
(see page 18).
Check the settings at the solar control unit and correct
them if required.
Separate operating instructions
Close the flap.
Troubleshooting
29