What To Do If; Rooms Are Too Cold - Viessmann VITODENS Operating Instructions Manual

Rooms are too cold

Cause
The heating system is switched OFF
ON indicator "8" (green) OFF
Control unit or remote control incor-
rectly adjusted
Only when operating with DHW heat-
ing:
DHW priority (wp is displayed)
No fuel
Control unit fault: The display shows
"U", and the red fault indicator flashes
Burner fault: "E" is displayed and the
red fault indicator on the control unit
flashes
Remote control fault
Remedy
Switch system ON/OFF switch "8"
ON (see page 10)
Switch the main isolator ON, if
installed (outside the boiler room)
Check and, if required, reset/replace
the MCB/fuse inside the power distri-
bution board (main domestic MCB/
fuse)
Check and, if required, correct adjust-
ments (see page 11 or the operating in-
structions of the remote control).
Wait until the DHW cylinder has been
heated up or no more DHW is drawn
off when operating an instantaneous
water heater (p is extinguished from
the display)
For LPG:
Check the fuel stock and re-order, if re-
quired.
With natural gas:
Open the gas shut-off valve and check
with your gas supplier, if required.
Check the fault code on the display
(see page 17) and notify your local
heating contractor
Press burner fault reset "E"; if that at-
tempt to start also fails, notify your
heating contractor.
Notify your local heating contractor

What to do if...

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