What To Do If; Rooms Are Too Cold; Troubleshooting - 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)
In connection with the Vitotronic 200-H
or extension kit for heating circuits with
mixer: The ON/OFF switch on the
mixer motor is switched OFF
No fuel
"Fault" and "E" are displayed; the red
fault indicator at the control unit
flashes
Control unit fault: "Fault" is displayed
and the red fault indicator flashes
Remedy
&
Switch system ON/OFF switch "8"
ON (see page 9)
&
Switch ON the main isolator, if
installed (outside the boiler room)
&
Reset circuit breaker inside the
power distribution board (main
domestic MCB).
Check settings and correct, if required:
& Room temperature (see page 18)
& Time (see page 31)
& Time program (see page 19)
Wait until the DHW cylinder has been
heated up or when no more DHW is
drawn off when operating an instanta-
neous water heater (p is extinguished
from the display)
Switch ON/OFF switch on the mixer
motor ON, I = ON
With oil/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.
Press burner fault reset "E".
Press burner fault reset "E" – if that
fails, notify your heating contractor.
Scan the type of fault (see page 35)
and notify your local heating contractor

What to do if...

37