Glow-worm ASCOT 1.4S - Page 16

7.1
Pilot
wilt
not tight
CAUSE
Operating
instructions
not
correctly
carried
out. _
Gas
inlet prcssure
inadcquatc/restricted.
Air
in
gas
linc.
Pilot
supply
blocked.
(a)
Remove pilot
injector
and
press
on
I
knob,
gas
flows
freely.
(b)
No
gas
when
on
I
tnob
is
pressed-
Gas
supply
to
pilor,
but
pilor
will
not
lighr.
_-
Spark
at elecrrode,
but
pilot
srill nor
lighting.
No
spark
at electrode.
7.2
Pilot
will
not
stay
alight
when
Control
CAUSE
Thermocouple
has
faulty
contact
at
main gas
conrrol
unit.
Faulty
electro-magnet
unit.
Outcr
case
serl inelfectivc.
7.3
Main
Gas
will
not
light
when
Hot
CAUSE
REMEDY
Follow lightjng
instructions conectly.
Check all
gas
cocks
arc open
and
gas
line
is unrestricted.
Purge
out
air.
Clean
injector.
Clean
pilot
filtcr
and
gas
ways.
Check
there
is
a
spark ar
elecrode by
placing
an
eanhed screwdriver 2mm
away from eiecuode
and
pressing
conrrol knob.
Check
correct
gap
between
pilot
and
elecrrode,
see
diagram 13.
(a)
Check ignition
lead for
shorting our.
renew if
defective.
(b)
Renew faulty
piezo
unir.
Knob
is released.
REMEDY
Pilor
flame
not
impinging
on thermocouple.
Check
pilor
is
correctly
posirioned,
see
diagrarn 12.
Renew
pitot
if no
thermocouole
flame evidenr.
Thermocoupie
tip
burnt
away.
Check
for
partial
blockaee and clcrn.
Renew thermocouple.
Check
ftat
thermocouple
conract in main
gas
control
is
tight.
Nore. One
quarter
turn
beyond
finger tight is
adequare.
Renew thermocouple
Renerv unit.
Check
casc fitted
conecrlv.
Chcck seal
is nor
damaeed
and is
searcd correcilv.
Faulty
rirerinocouple
Tap
is opened
REMEDY
Insufficient
warer
flow/inadequate
pressure
(a)
Cistern
supply
(b)
lvlains
supply
(whcn
othcr
cold
warer
draw
off taps
in
use).
Inlct
wa(cr
supply rcsricred
by
stop
cock
Air
lock
in
supply
pipes.
Hcrt
cxchanger
fouled
by
2n6d
1
A
Raise tank
or connccl
to main-s
suppll,
(subject
to watcr
undcrraking
,-crulations).
Connect to cistcrn
supply if hcatj
is availablc
consult
wal.ci
(:ompany
with
rcgard
tc
lorv
prcssure.
Fully opcn all
stop cocks.
Remove air lock.
Dcscale or changc
h,:rt exchangcr.
scalc.