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

Vitocrossal 300 CA3 Series 2.5 to 6.0 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 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.
"Fault" is displayed. The red fault indicator flashes on
the control unit enclosure.
(see page 37).
Remedy
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)
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
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).
DHW heating must be enabled.
Check the settings and correct if required:
H Operating program (see page 27)
H DHW temperature (see page 27)
H Time program DHW heating (see page 27)
H Time (see page 29)
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 33).
Notify your heating contractor if necessary.
Troubleshooting
.
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