19
7
7..8
8 T
To
o R
Re
ep
plla
acce
e F
Fu
usse
e o
orr P
PC
CB
B
Isolate electrical supply :
((A
A)) F
FU
US
SE
E ::
- Pull out fuse holder (A) from board and
slide fuse out of holder (see fig. 31).
((B
B)) P
PC
CB
B ::
- Remove connections (fan, microswitch,
pressure switch).
- Disconnect mains supply cable from ter-
minals.
- Remove two nuts and washers (B) retai-
ning thermocouple and conductor lead.
- Remove fuse and ease board from plas-
tic retaining clips.
- Remove four screws and remove PCB.
- Re-assemble in reverse order.
F
Fiig
g.. 2
27
7
7
7..1
10
0 T
To
o rre
ep
plla
acce
e p
prre
essssu
urre
e ssw
wiittcch
h
- Isolate electrical supply.
- Remove two screws securing plastic turret cover.
- Pull off tag connectors from terminals.
- Remove low pressure tube from pressure switch.
- Remove two screws securing pressure switch to
bracket.
- Lift off pressure switch dis-engaging it from the
high pressure tube.
- Remove “O” ring from spiggot on the underside of
the pressure switch.
- Replace in reverse order referring to colour coding
label on top of appliance.
7
7..1
11
1 A
Ad
djju
ussttm
me
en
ntt o
off p
prre
essssu
urre
e ssw
wiittcch
h
a
a))
If a pilot extinction occurs within 10 seconds of turning the hot tap off, it is possible that the pressure switch is
out of adjustment, if the pressure switch remains in the high flow position in excess of 10 seconds after the fan
switches to low speed interruption of the current to the thermoelectric valve occurs.
It is possible to adjust the pressure switch to ensure a rapid return from high to low flow.
A
Ad
djju
ussttm
me
en
ntt S
Se
eq
qu
ue
en
ncce
e ::
- Adjusting the pressure switch.
- Ensure the front case is on.
- Isolate electrical supply.
- Remove two screws securing plastic turret cover
and lift off cover.
- Remove terminal cover from pressure switch expo-
sing the adjusting screw (A) and remove securing
paint (see fig.32).
- Set a multimeter to 240 V scale and connect it
across the common and one other terminal of the
switch.
- Re-establish electrical supply and ensure that gas is
off at gas control.
- Turn on a hot tap to give high fan speed.
- Using a suitable screwdriver screw the adjusting
screw (A) in until changeover of the pressure switch
contacts are observed.
- Screw out adjusting screw (A) 3 turns to achieve the
setting point.
- Check operation of the pressure switch (see section 5.5.).
- Replace the plastic terminal cover on the pressure
switch.
- Replace the plastic turret cover and fixing screws.
b
b))
If main burner extinction occurs during hot water demand, it is possible that the pressure switch is out of
adjustment. Screw adjusting screw (A) out until flush with top of moulding, then follow adjustment sequen-
ce above.
F
Fiig
g.. 3
32
2
A
A
B