Specifications
Repeat
the following
cnecKS:
A. Earth Continuity.
C.
Polarity.
D. Resistance
to
Earth
according
to Instructtons
for British Gas
Multimeter.
Does
Maan
Burner
light?
Does
Pump run?
Difterentral
Valve
tested?
Are
Pump
Setting
Terminals
tested?
240
V AC
lrom termrnal
5tol.
Replace
faultY
DC Solenoid.
connectlons
on
FFD
tested?
Move
Heating
Switch
ON-OFF-ON.
Diaphragm
pin
on
Difterential
Valve
has to
move
OUT-lN-OUT.
If not,
'1
.
Clean
Venturi
2. Check
Diaphragm
at differential
valve
and
replace,
jf
necessary.
Ref. to
note
1 1 .
Check
pump
accordrng
to lnstructions
tor
British
Gas
Multimeters,
Procedure
9.
)
.!
Note
Attention!
Pull otf
the
NTC-plug
for
a short
time only
be-
cause
the
normal
temperalure
control
is
out of
function
in that
position. In this
case
the
appliance
is only
protected by the
overheatcut-
off
device.
8:
For
this
purpose,
open
the control
box
as described
in
Note
1.
Unscrew
the
pilot gas
tubes
of
the thermo-
electric
casing
and
check
it
the black
cables
oJ
the
micro
switch
are
tight.
AfteMards
install
pilot gas
tubes
again
Before
re-assembling
the control
box.
check
the
fine-
wire
tuse of
the
eleitronic.
lf necessary.
replace
it'
Attach
plugs
A and
B
again
and
re-assemble
control
box.
9:
For
this
purpose,
open
control
box
as described
in
-
f.fote
f .
Pull'off
the
multicontact
plugs
A and
B The
electronic-printed
circuit
can
be
removed
.by
unscrewind
the
cross-recessed
head screw
on
the
left
hand siddof
the control
box.
Pull
out
the
printed
iircuit
towards
the
front and
pull
off
the
multicontact
plug
as
well as
the
white
cable.
Install
the electronic-printed
circuit
in reverse
order'
Note
1 O:
Attention:
External
llnes
must
not be
connected
to
the
terminals
l,
ll and
lll
(short
circuit!)
The black
cable can
be
connected
to
terminal
l,
ll
or
I ll
'
It must
be checked
whether
the
black
cable
is
connected
tightlY
enough
Note11:
lf the
movement
of
the diaphragm
pin
cannot
be
checked
optically.
the
pressure
ditferential
switch
must
be removbd
by unscrewing
the 3
screws
Do not
unscrew
the two
connection
tubes!
Under
perfect
function
the
diaphragm
pin
cannot
be
pushed
back by
hand,
when
pump
oprates.
lf
lhis is,
however,
possible,
the
venturi
tube'
Pressure
difierential
iwitch,
connectionstubes
or
pump,
must
be
checked.
Special
attention
must be
given to the
tact
that
the
venturi O-ring
ist
nol damaged.
RE