Table of Contents
Advertisement
FAULT FINDING - Page 20
SYMPTOM
LOW WATER TEMPERATURE
NOISY HEATER
POSSIBLE CAUSE
1.
Gas pressure too low.
2. Faulty diaphragm. Will also cause a high
water rate.
3.
Automatic gas valve push rod sticking.
May also cause a high water rate
4.
Slow ignition screw incorrectly set. Will
also cause a high water rate.
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.
SOLUTION
1.
Check and clean gas filter, also
check gas inlet pressure.
2.
Replace the Diaphragm
Assembly - Part No 10/17572.
3.
Dismantle clean and regrease
using Dow Corning 111 silicone
grease. Handle the push rod
with care, do not bend.
4.
See Fig.16 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.
1.
Descale or replace - Part No
10/17558.
2.
See Fig. 16 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.
Advertisement
Table of Contents
