Rooms Are Too Hot; There Is No Dhw - Viessmann Vitotronic 300 Series Operating Instructions Manual

Troubleshooting

Rooms are Too Hot

Cause
H Control unit incorrectly adjusted.
H The remote control (if installed) is set incorrectly.
Separate operating instructions
is displayed. The red fault indicator flashes on the
control unit enclosure.
The mixing valve 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.
is displayed. The red fault indicator flashes on the
control unit enclosure.
42
(see page 40).
Remedy
Check the settings and correct if required:
H Operating program (see pages 20 or 25)
H Room temperature (see pages 19 or 24)
H Time (see page 34)
H Room temperature time program (see pages 20 or 25)
H Heating curve (see pages 21 or 26)
Check what type of fault it is. Acknowledge the fault
(see page 38). Notify your heating contractor if necessary.
Adjust the mixing valve manually.
Close the flap.
Remedy
H Switch ON the ON/OFF switch on the control units
(see page 15).
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 30)
H DHW temperature (see page 30)
H Time program DHW heating (see page 31)
H Time (see page 34)
With oil/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 38).
Notify your heating contractor if necessary.
Vitotronic 300, GW6B Operating