Cause
Remedy
The heating system is switched OFF.
The ON/OFF indicator
8
(green) is
OFF.
&
Switch ON the ON/OFF switch "
8
"
(see page 8).
&
Switch ON mains electrical isolator, if
installed (outside the boiler room).
&
Check the circuit breaker inside
power distribution (main domestic
circuit breaker) and reset it, if
required.
The control unit or the remote control
unit is incorrectly adjusted.
Adjust the heating program "
G
".
Only when operating with DHW load-
ing:
DHW priority (
wp
in the display).
Wait until the DHW cylinder has been
heated up or, if an instantaneous water
heater is installed, until no more DHW
is being drawn (
p
extinguishes in the
display).
No fuel.
LPG:
Check fuel level and, if necessary, re-
order fuel.
Natural gas:
Open the gas shut-off valve and check
with your gas supplier, if required.
Control unit fault: "
U
"is displayed and
the red fault indicator flashes.
Check the fault code on the display
(see page 25) and notify your local
heating contractor.
Burner fault: "
E
" is displayed and the
red fault indicator on the control unit
flashes.
Press burner fault reset "
E
"
–
if that
attempt to start also fails, notify your
heating contractor.
Heating water temperature or required
room temperature too low.
Raise the heating water temperature or
the required room temperature (see
remote control operating instructions).
Remote control fault.
Notify your local heating contractor.
... rooms are too cold?
23
What to do if ...
55
92
453
GB
