8
8
It is recommended that a full service be carried out at least
once a year by a qualified heating engineer (CORGI
Registered).
4
4..1
1 C
Clle
ea
an
niin
ng
g tth
he
e H
He
ea
atte
err
4
4..1
1..1
1 M
Ma
aiin
n B
Bu
urrn
ne
err
Lower bottom pan by removing wing screws on the unit base.
Disconnect pilot pipe, and thermocouple lead from multifunctional
control.
Remove the two burner retaining pins holding the burner
assembly in place.
IIM
MP
PO
OR
RT
TA
AN
NT
T:: D
Do
o n
no
ott a
atttte
em
mp
ptt tto
o rre
em
mo
ov
ve
e tth
he
e g
ga
as
s m
ma
an
niiffo
olld
d tto
o
e
ea
as
se
e rre
em
mo
ov
va
all o
off tth
he
e b
bu
urrn
ne
err a
as
s tth
hiis
s c
co
ou
ulld
d s
se
erriio
ou
us
slly
y a
affffe
ec
ctt tth
he
e
c
co
orrrre
ec
ctt o
op
pe
erra
attiio
on
n o
off tth
he
e a
ap
pp
plliia
an
nc
ce
e iiff iitt iis
s n
no
ott rre
e-p
po
os
siittiio
on
ne
ed
d e
ex
xa
ac
cttlly
y
a
as
s iin
ntte
en
nd
de
ed
d.. T
Th
he
e a
as
ss
se
em
mb
blly
y c
ca
an
n n
no
ow
w b
be
e llo
ow
we
erre
ed
d ffrro
om
m tth
he
e u
un
niitt..
N
NO
OT
TE
E:: O
On
n rre
effiittttiin
ng
g tth
he
e b
bu
urrn
ne
err a
as
ss
se
em
mb
blly
y e
en
ns
su
urre
e tth
ha
att tth
he
e s
sllo
otts
s a
att
tth
he
e ffrro
on
ntt o
off tth
he
e b
bu
urrn
ne
err a
arre
e c
co
orrrre
ec
cttlly
y llo
oc
ca
atte
ed
d o
on
n tth
he
eiirr s
sh
ho
ou
ulld
de
err
rriiv
ve
etts
s a
an
nd
d tth
ha
att tth
he
e rre
etta
aiin
niin
ng
g p
piin
ns
s a
arre
e rre
effiitttte
ed
d iin
n tth
he
e c
co
orrrre
ec
ctt
llo
oc
ca
attiio
on
n..
Clean the burner ports (avoid using hard, sharp instruments
capable of damaging the ports) and check the injector (s) for
blockage. Clean carefully as necessary.
4
4..1
1..2
2 P
Piillo
ott B
Bu
urrn
ne
err
Inspect the pilot burner and thermocouple. Ensure they are clean
and in good condition.
C
Ch
he
ec
ck
k::
(a) The pilot burner is securely fixed.
(b) The thermocouple tip is not burned or cracked. Replace if
necessary.
(c) The pilot burner head is undamaged.
(d) The pilot pipe/pilot connection is gastight.
4
4..1
1..3
3 H
He
ea
att E
Ex
xc
ch
ha
an
ng
ge
err
After removing the burner assembly clean heat exchanger tubes
from bottom using a stiff brush ((n
no
ott w
wiirre
e)).
4
4..1
1..4
4 F
Fa
an
n a
an
nd
d M
Mo
otto
orr
Remove fan guard. Check fan is securely fitted to motor shaft
and for damage to blades. Clean fan blades as necessary taking
care not to damage them.
N
NO
OT
TE
E:: E
En
ns
su
urre
e a
allll ffo
ou
urr ffiix
xiin
ng
gs
s s
slle
ee
ev
ve
es
s a
arre
e ffiitttte
ed
d b
be
effo
orre
e rre
e-ffiix
xiin
ng
g
ffa
an
n a
as
s o
ov
ve
errttiig
gh
htte
en
niin
ng
g c
co
ou
ulld
d rre
es
su
ulltt iin
n rre
ed
du
uc
ce
ed
d ffa
an
n lliiffe
e..
4
4..1
1..5
5 G
Ge
en
ne
erra
all
Check wiring for possible loose connections paying particular
attention to the overheat thermostat interrupter leads.
Check air louvres in bottom pan are clean and unobstructed.
Clean as necessary.
4
4..2
2 O
Ov
ve
errh
he
ea
att T
Th
he
errm
mo
os
stta
att
The overheat thermostat, bulb mounted on the left inner side
panel (when facing front of unit) – body in junction box, will shut
off the gas supply to the main burner in the event of overheating.
The manual reset button is located beneath a black screw off cap
positioned on the side of the junction box. See Figs. 6 and 7.
It is a single pole single throw switch. The contacts open to shut
the combination gas control in the event of the unit overheating.
This overheat thermostat should operate only when something is
wrong with the unit. Whenever this thermostat operates, the
problem should be identified and corrected immediately or
serious damage may result. If the overheat thermostat cuts off
the gas supply during normal operation:
1. Make sure deflector blades are open and that there are not
any obstructions in the air inlet or discharge outlet.
2. Check actual input to unit against rated input.
3. Check motor is operating.
4. Check fan is not loose on motor shaft.
5. Check fan speed against motor data plate.
6. Check flue system is not damaged or blocked. Also check
unit is flued correctly and that there is not a negative
pressure in the building adversely affecting draught.
7. Clean heat exchanger tubes inside and out if necessary.
8. Check operation of fan delay timer.
9. If items 1 to 8 do not solve the problem, check overheat
thermostat and replace if necessary.
IIM
MP
PO
OR
RT
TA
AN
NT
T N
NO
OT
TE
E:: T
Th
he
e o
ov
ve
errh
he
ea
att tth
he
errm
mo
os
stta
att o
on
n tth
hiis
s u
un
niitt
h
he
ea
atte
err w
wiillll s
sh
hu
utt o
offff tth
he
e g
ga
as
s s
sh
ho
ou
ulld
d e
ex
xc
ce
es
ss
siiv
ve
e d
diis
sc
ch
ha
arrg
ge
e
tte
em
mp
pe
erra
attu
urre
es
s o
oc
cc
cu
urr.. D
Do
o n
no
ott a
atttte
em
mp
ptt tto
o c
co
on
nttrro
oll tth
he
e ffa
an
n w
wiitth
h tth
he
e
o
ov
ve
errh
he
ea
att tth
he
errm
mo
os
stta
att.. A
An
ny
y c
ch
ha
an
ng
ge
e iin
n w
wiirriin
ng
g tto
o a
atttte
em
mp
ptt tto
o c
co
on
nttrro
oll
tth
he
e ffa
an
n w
wiitth
h tth
he
e o
ov
ve
errh
he
ea
att tth
he
errm
mo
os
stta
att w
wiillll rre
es
su
ulltt iin
n h
ha
az
za
arrd
do
ou
us
s
c
co
on
nd
diittiio
on
ns
s a
an
nd
d iin
nv
va
alliid
da
atte
e tth
he
e w
wa
arrrra
an
ntty
y..
4
4..3
3 T
Te
es
sttiin
ng
g a
afftte
err S
Se
errv
viic
ciin
ng
g
After re-assembly restore the electrical and gas supplies. Light
the appliance (see Lighting Instructions on inside of casing) and
check the gas connections for soundness as follows:
Close gas supply cock at the meter.
Remove the screw in the inlet pressure test point and connect a
manometer to the test nipple. Open the gas supply cock at the
meter and the appliance gas cock. Record the static pressure.
Close the gas supply cock at the meter and watch the pressure
gauge for approximately 3 minutes. Any decrease in pressure
(after the first minute of temperature stabilization) indicates a
gas leak which must be cured (first check connection of
manometer to test nipple). When satisfied remove manometer
and refit test nipple sealing screw.
4
4.. S
SE
ER
RV
VIIC
CIIN
NG
G
CAUTION
Always turn off the gas supply at the gas cock and
disconnect the electricity supply to the appliance before
servicing or replacing any components.
!
