17
7
7.. R
RE
EP
PL
LA
AC
CE
EM
ME
EN
NT
T O
OF
F C
CO
OM
MP
PO
ON
NE
EN
NT
TS
S
Before commencing any work involving component replacement :
1
1..
Isolate electrical supply.
2
2..
Turn off gas at the gas service cock.
3
3..
Turn off water at the water inlet cock.
4
4..
Drain the appliance by opening hot water outlet tap and removing the drain plug in the water service cock.
5
5..
Remove the front casing (see Section 6.1).
7
7..1
1 T
Th
he
errm
mo
occo
ou
up
plle
e
- Remove the burner (see Section 6.2).
- Remove the pilot (see Section 6.3).
- Trace the thermocouple and disconnect at the ter-
minal on the PCB.
- Disconnect at thermoelectric valve by undoing nut
(A) (see fig. 23).
- With a 7 mm boxspanner, unscrew the nut (B) holding
the thermocouple into the gas section (see fig. 24).
- Thread the thermocouple and wire up through the
gas section.
- Replace in reverse order.
F
Fiig
g.. 2
23
3
F
Fiig
g.. 2
24
4
7
7..2
2 S
Sp
pa
arrk
k E
Elle
eccttrro
od
de
e
- Remove the burner (see Section 6.2).
- Remove the electrode retaining screw (A) (see fig.
25).
- Pull off the electrode cable from the piezo cartridge.
- Lift the electrode out of the gas section.
- Re-assemble in reverse order, and note that the slot
in the connector on the end of the electrode cable
is vertical when pushed onto the cartridge.
N
NO
OT
TE
E
: Spark gap is 3-5 mm.
F
Fiig
g.. 2
25
5
7
7..3
3 T
Th
he
errm
mo
oe
elle
eccttrriicc v
va
allv
ve
e
- To renew, remove the thermocouple conductor
lead nut (A) (see fig 26).
- Unscrew cap (B) from the side of the gas section
and withdraw the thermoelectric valve.
N
NO
OT
TE
E
: This heater is fitted with a safety interlock.
When the pilot is turned off, the appliance cannot be
relit until the thermocouple cools down and the ligh-
ting sequence is repeated.
F
Fiig
g.. 2
26
6
7
7..4
4 W
Wa
atte
err S
Se
eccttiio
on
n V
Ve
en
nttu
urrii
·- Disconnect the right hand heating body leg from the
water section and remove the venturi (A) (see fig 27).
- Clean or replace as necessary and the re-assemble
in reverse order.
F
Fiig
g.. 2
27
7
A