Rooms Are Too Cold - Viessmann VITOCROSSAL 300 Operating Instructions Manual

Troubleshooting

Rooms are Too Cold

Cause
The heating system is off
H Control unit incorrectly adjusted.
H The remote control (if installed) is set incorrectly.
Separate operating instructions
Only when operating with DHW heating:
The DHW tank is being heated.
No fuel.
"Burner fault" will be displayed.
"Fault" is displayed. The red fault indicator
flashes on the control unit enclosure.
The mixing valve motor is faulty.
Emissions test switch is set to
38
(see page 37).
Vitocrossal 300 CA3 Series 2.5 to 6.0 Operating
Remedy
H Switch ON the ON/OFF switch on the control units
(see page 17).
H Switch ON the mains isolator, if installed (outside the
boiler room).
H Set the MCB in the power distribution board (main
domestic MCB).
Central heating must be enabled.
Check the settings and correct if required:
H Operating program (see pages 18 or 22)
H Room temperature (see pages 21)
H Time (see page 29)
H Time program, central heating (see pages 19)
H Heating curve (see pages 23)
Wait until the DHW tank has been heated up.
Reduce the DHW draw-off rate or temporarily reduce
the standard DHW temperature as required
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.
Follow the display prompts.
Reset the burner only once.
WARNING
If faults are not rectified, they can have life threatening
consequences. Do not acknowledge fault messages
several times in quick succession. Notify your heating
contractor if a fault recurs. Your heating contractor will
be able to analyze the cause and rectify the fault.
Check what type of fault it is. Acknowledge the fault
(see page 33). Notify your heating contractor if necessary.
Adjust the mixing valve manually.
Set the emissions test switch to position .