Supplied By www.heating spares.co Tel. 0161 620 6677
29
Part No. 5000893
SYMPTOM
POSSIBLE CAUSE
SOLUTION
3. Faulty diaphragm. Will also
cause a high water rate.
4. Automatic gas valve push rod
sticking. May also cause a high
water rate.
5. Slow ignition screw incorrectly
set. Will also cause a high water
rate.
6. Frost damage to thermostat
bulb, recognised as a crushed
bulb.
7. Thermostat throttle stuck in the
open position. Will also cause a
high water rate.
3. Replace the Diaphragm
Assembly - Part No. 10/17534.
4. Dismantle clean and regrease
using Dow Corning 111 silicone
grease. Handle the push rod
with care, do not bend.
5. See Fig.23 for the position of the
screw. Turning the screw
clockwise delays the ignition,
anti-clockwise advances the
ignition. The screw should be
set 2 full turns out (anti-
clockwise) from the fully in
position. When correct th burner
ignition should be smooth and
quiet when a hot water outlet is
opened.
6. Replace thermostat assembly -
Part No. 10/13486.
7. Descale, regrease and replace
'O' rings as necessary.
LOW WATER TEMPERATURE
CONT
1. Descale or replace - Part No.
10/17558.
2. See Fig.23 for the position of the
screw. Turning the screw
clockwise delays the ignition,
anti-clockwise advances the
ignition. The screw should be
set 2 full turns out (anti-
clockwise) from the fully in
position. When correct the
burner ignition should be
smooth and quiet when a hot
water outlet is opened.
3. Clear injector by blowing
through or replace with pilot
injector Part No. 19/12690. Also
clean the lint filter located at the
base of pilot tube.
4. Carefully clean the burners with
a vacuum cleaner.
1. Heat exchanger scaled.
Ultimately this will cause the
heat exchanger fins to discolour
and buckle.
2. Noisy ignition could be caused
by incorrect setting of the slow
ignition screw.
3. Reduced pilot rate caused by
dirt.
4. Burner aeration ports and main
flame ports blocked.
NOISY HEATER
Fault Finding
