{bl
Using a pair
of
fine nosed pliers, pull the cir·clip
off
and
re
move
the
micro
-switc
h assembly
from
the valve.
(c) Dra
in
d
own
the heati
ng
and domestic
water
systems.
Remove
the
hot
water heat exchanger described
in
Part 11,
a, b, c, d, e, f and g.
(d)
U
ndo
the remaining
water
connections
to
t
he
dive
rt
ing
valve and remove
comp
le
te
with
lhef
ibre
sea
ling washers.
{e) Reasse
mb
le a
new
valv
e
in
the
reverse order
re
placing
the
fibre washers between each connection. No
ot
h
er
sealing
compound shou
ld
be used.
(fl
Open all
ra
di
at
or
valves and
1il1
the
system
venting as
ne
cessary.
The
a
ppl
iance
is
fitted
with
a
manu<iol
air
vent
on
the
ou
tlet
of
the
black heat exchanger. See Fig.
40
.
13
.
TO
REPLACE THE
FLOW
REGULATOR
!Figs. 40 and
41
.)
(a!
Turn
off
the
ma
ins cold
water
supply at the service
cock
.
Ur\Screw
the
flow
regu
lato
r housing
un
ion
nut
.
(b)
Ease
the
co
ld water connection
as
ide and remove the
sealing washer, wire
fi
l
ter
and
plastic
flow
regu
lato
r from
t
ne
ho
usjng. If this Is prevented because t!'le pipe
work
is
fixed:
(i
l
Turnoff
t
he
mains
cold
wat
er supplyi
othe
dwelling.
{iii
Uns
c
r~w
the
flow
regu
lato
r housing un!
on
nut
and
15
mm
compression f!t1i
ng
at t he service
cock
.
hi
il
Ease rhe assemb
ly
away
from
the
p!pewo•k
and
remove the sealing washer wire fFiter and plastic fl
ow
regulator from
the
hous
ing.
!c
I Fit a replacement f
low
regu
la
tor
. Clean tne wi
re
f
ilt
er and
reassemble in reverse order replacing the
iib
re
sealing
washer.
No
other
sealing
compo
und s
hou
id be used.
14
.
TO
REPLACE THE CIRCULATING
PUMP
(Fig
.
38.)
~a}
Remove the f our
No
. 6 self t
app
i
ng
screws
ho
ldi
ng
the
service cover in
to
the
base
of
the electrical tray.
{b) Turn off the is
olat
ing vaives
mou
nted
on
the inlet and
outlet
of
the
pump
.
(
C)
Hinge the electrical
tfay
up
ar.
d clip back into place. Secure
the electrical tray
to
one
of
the si
de
panels with the original
M5he.xagon headed
screw
located
on
th
efro
n
tins
ideedge
of
the
side pane
l.
(d) Undo
the
two
un
i
on
nuts
a
nd
remove
the pump from
between
t
he
pi
pewmk
.
(e)
Supporting
th
e pump so as not to strain the
electric;;~
I cable,
remove the electrical
cove
r and discon
nect
the
eiec
tr
ic
a!
w ires.
Tal<e
note
of
the w i
re
positions.
If) Install a replace
ment
ci
rculating
pump
with
new
sealing
washers in
re
ve
rs!!
or
der.
NOTE: The direction
offlow
on
the circulating pump should
po
i
nt
from l
efT
to
right. The replacement pump
if
fi
tted
with
speed adjustment should
be
set
at
maximum
speed.
15.
TO
REPLACE THE
WATER
DIVERTING
VALVE
MICRO-SWITCH
ASSEMBLY
(Figs.
39
and 41 l
(a)
R
ot
ate
the
body of the mi
cro
-
switch
assembly around until
access
is
gained
to
the
re
taining cir-clip
at
the opposite end
to
the
cord strain relief.
~b)
U
si
ng
a pair
of
fine nosed pliers
pu
ll the cir-clip
of
f and
remove the micro-
sw
itch assembly
from
the
vaive.
(c
) Hinge the electrical
tr
ay
up and
tempo
rarily clip back
int
o
posit
ion. To ensure
the
el
ect
rical
tr
ay
do
es
not
drop. replace
one
of
the
M5
hexagon
he
aded
screws
to t he
front
inside
edge
of
one side panel and
screw
finger
tigh
t.
fdl
Remo11e
the
therm
ostat
kno!>
by
grasping firmly and pulling
forward
off
the thermostat
sp
indle.
(
e)
Remove the
two
self tapping
screws
fr
om
the
top
edge
of
the
facia and
two
self-tapping screws trom under the
electrical
tray,
recessed
in
two
clearance holes.
which
hold
the fr
ont
facia in p
osit
i
on
.
(H
Pu
ll the facia fo
rward
to
disengage
it
from
the
electr
ical
tray. Then, supporting
the
facia. release the plug·
in
terminal
sttip
from
in
side the electrical cover
which
connects1he
3-position
switch
or
programmer assembly
if
this has been
fitted
. Unplug
the
Molex
connecto
r
at
the
driver board.
37
(g) Disconne
ct
the
grey,
wh
ite
, red, orange and viol
et
wires
ot
th
e mic
ro-sw
it ch
asse
m bly wiri
ng
harness
f
rom
1ermin
als4
, 1,
10,11
ar.d
12r
espective
ly
.
{h) Remove fr
om
th
e
micro-sw
it
ch
as:>embly wiring harness
the
cab:e t
ie
and
the
"
Heyco
" !:ord
stra
in r
elief
bush
re
st
r<~
ining
it
to
t
he
rear of
the
electr
ic
al
panel. Wi
thdraw
the
harness.
(i) Reassemble in the reverse
o~de
r
wi
th
a
new
sw
itch and
harness assembly.
16. TO REPLACE THE
PUMP
OVERRUN
THERMOSTAT
~Fig
.
42
.1
Check
thai
the
elec
tr
ical su
pp
ly
has been turned OFF.
Ia) Remove
the
electri
r.
al
connectio
ns
to
the
thermostat
mak
i
ng
careful
nnte
of
:heir
posit
ion.
(bl
Unscr
ew
the
two
M4 scr
ews
securi
ng
the
th
ermostat to
its
mount
i
ng
pl
ate.
(c) Fit the
new
thermostat and reconnect
the
electrical ieads,
refer
ri
ng
to
the
w iri
ng
diagram Fig.
27.
1 7.
TO
REPLACE THE
OVERHEAT
THERMOSTAT
(Fi
g.43
.)
Check that the electri
city
supply has beer.
tu
rned
OFF
.
!a}
lie
move
the
inner casi
ng
and the right hand cabl!lElt side
panel
as
descf
ib
ed in
Se
c
tion
8
-I
ns
tallation.
Inst
r
uct
ions
1
1a
and 1
1b
.
{b) R
emo11e
the
seali
ng cov
er
on the ri
ght
hand side
of
the boi:
er
casing held in
po
sit
ion
with
two
M5
screws
, accessible
from
inside
1h
e
bo
iler casing.
{c) Remove
the
split pin hQm the pocket located
on
the t:e
at
exchanger
at
the
right hand side tmd
n~
m
ove the
therm
os
tat
phia
i.
~d
)
P.ais
e the electrical
mw
and temporarily secure
it
in
positi
on
by replac
in
g one M 5 hexagon head
screw
to the front
insi~e
edge
of
the left hand si
de
pane
l.
(e)
R
emove
the
fac
ia assembly
by
follo
win
g
Instruct
i
on
15 d,
a and
f.
(f
) Remove
the
c
ent
ral clamping
nut
. Push t
he
thermost
at
b
ack
to
disengage the spindle and ease a
way
from
the
support bracket
suff
ic
iently
to
gain access t o
the
electrical
connections.
igl
Pull
off
the
e
l
ectric~:~
I
Go
nn
ec
tions i rom t
he
therm
os
ta
t.
(h) To
withdraw
the
the
rm
ostat
carefu
lly
thread t
he
capiUary
through
the
hole in
the
rear of the electrical cover.
Ol
F
it
a
new
the
r
mostat
in the reverse orde
r.
F
or
re
pla
c
ement
of
the
following
parts
the
elec
trica
l
tray
must
be
hinged
downwards
: Unscrew the hexagon head
ed
screw
at
the
front inside edge
of
each side
ptmel
. Hinge rhe
electri
c
l11
ua
y
down
a small
am
ount
vntil
it can
slid
e
forwa
rd on
it
's
rwo
hooks
. Slide the
tray
forward
to
the
from
of
each
hook
then
allow
the
elecrr
i
ca/
rray
to
pi
vo
t
vertically
downwards
s
up
port
ed
by
the
twa
h
ook
s.
The
facia
assemb
ly
may
the
n be re
moved
by
following
instructions
15
d,
e
and
f.
18
.
TO
REPLACE THE
FAN
PRESSURE
SWITCH
(Fig.
44
.1
(a) Pull
off
the
tw
o
fl
exible tubes from the
bottom
of t
he
pressure
swi
t
ch
,
(
bl
Pu
ll
ofi
the
1hree electrical
connect
ion
s from
the
front of
the
pressure
sw
itch.
(C)
Aemo11e
two
M4
screws holding the pressure
sw
it
ch
to
·the
electr
i
ca
l cover and remove t
he
switch.
ld
l
Rep
lace the
new
f
an
press
ur
e
switch
in
the
reverse order
and ensure:
i) The three el
ec
tr
ical connect1ons are made
to
the
follow
ing
term
inals marked on the pressure
sw
i
tch
:
1
NC
white
, 2NO grey and PCOM
brown.
i
i\
The flexible
tube
ends are marked + and - and mu
st
be connected
to
the correct pressure
po
ints
on
the
pressure
swit
ch. The -
pr
essure
point
is near
the
front
and
the
+ pressure point is near the back.
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