45
Cause Remedy
The heating system is switched off. ■ Turn on the ON/OFF switch (see dia-
grams from page 22).
■ Switch on the mains isolator if installed
(outside the boiler room).
■ Reset the MCB in the power distribution
board (main domestic MCB).
■ Control unit incorrectly adjusted.
■ The remote control (if installed) is set
incorrectly.
Separate operating instructions
Central heating must be enabled.
Check settings and correct if required:
■ Operating program (see page 25)
■ Room temperature (see page 25)
■ Time (see page 36)
■ Central heating time program (see
page 25)
■ Heating curve (see page 26)
The DHW cylinder is heated. Wait until the DHW cylinder has been
heated up.
Reduce the DHW draw-off rate or tempo-
rarily reduce the standard DHW temper-
ature as required.
Note
In the case of operation with an instanta-
neous water heater, stop DHW draw-off.
No fuel. 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.
What to do if...
Rooms are too cold
5592 682 GB
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