Viessmann Vitopend 100-W - What to do if...; Rooms are too cold

35
Cause Remedy
The heating system is switched off. ■ Turn on the ON/OFF switch (see dia-
grams from page 10).
■ Switch the mains isolator ON (if instal-
led).
■ Check the MCB/fuse in the power dis-
tribution board (main domestic MCB/
fuse).
■ Control unit incorrectly adjusted.
■ The room temperature controller (if in-
stalled) is set incorrectly.
Separate operating instructions
Central heating must be enabled.
Check the settings and correct if re-
quired:
■ Operating program (see page 20)
■ Room temperature (see page 18)
■ Time program, central heating (see
page 20)
■ Heating curve (see page 24)
Message code 06 flashes.
on
The pressure in the heating system is
too low. Top up with water or notify your
local heating contractor.
Symbol is shown and message code
F02, F03, F04, F05, F07 or F08 is flash-
ing.
Simultaneously press keys MODE and
OK, until the symbol flashes (reset).
Contact your local heating contractor if
the fault reappears on the display.
What to do if...
Rooms are too cold
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