Cause
Remedy
The control unit or the remote control
unit is incorrectly adjusted.
Check the room temperature setting
and correct, if required.
Control unit fault: "
U
" is displayed and
the red fault indicator flashes.
Check the type of fault (see page 25)
and notify your heating contractor.
... no DHW is available?
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 10).
&
Switch ON the mains electrical isola-
tor, if installed (outside the boiler
room).
&
Check the circuit breaker inside
power distribution (main domestic
circuit breaker) and reset it, if
required.
Control unit incorrectly adjusted.
Check settings and correct if required:
&
DHW loading must be switched ON
(see page 11)
&
DHW temperature (see page 14)
No fuel.
LPG:
Check fuel level and re-order fuel, if
required.
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 type of fault (see page 25)
and notify your heating contractor.
Burner fault: The red fault indicator of
the control unit flashes and "
E
" is dis-
played.
Press burner fault reset "
E
"
–
if that
attempt to start also fails, notify your
heating contractor.
... rooms are too hot?
24
What to do if ...
55
92
453
GB
