32
Cause
Remedy
The heating system is off.
■
Switch ON the ON/OFF switch on the control units
(see page 12).
■
Switch ON the mains isolator, if installed (outside the
boiler room).
■
Set the MCB on the power distribution board (main
domestic MCB).
■
Control unit incorrectly adjusted.
■
The remote control (if installed) is set incorrectly.
Separate operating instructions
DHW heating must be enabled.
Check the settings and correct if required:
■
Operating program (see page 22)
■
DHW temperature (see page 22)
■
Time program DHW heating (see page 22)
■
Time (see page 25)
No fuel.
With LPG:
Check the fuel reserves and re-order if required.
For natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
"Fault"
is displayed. The red fault indicator flashes.
Check what type of fault it is. Acknowledge the fault
(see page 28). Notify your heating contractor if neces-
sary.
The DHW is too hot
Cause
Remedy
The control unit is set incorrectly.
Check and correct the DHW temperature if required
(see page 22).
The DHW is being heated by the solar thermal system.
Check the settings at the solar control unit and correct
them if required.
Separate operating instructions
Emissions test switch is set to .
Close the flap.
"Fault" will be displayed
Cause
Remedy
Heating system fault.
Proceed as described on page 28.
"Service" will be displayed
Cause
Remedy
The time for a service, as specified by your heating
contractor, has arrived.
Proceed as described on page 28.
What to do if...
There is no hot water
5546 498 CA
