19
7. FAULT FINDING – Page 19
SYMPTON
POSSIBLE CAUSE
SOLUTION
PILOT LIT BUT MAIN BURNER
WILL NOT LIGHT ON WATER
FLOW
1.
Gas inlet pressure low.
1.
Call in your local British Gas
Region
2.
Low waterflow caused by blocked
water filter.
2.
Clean the debris from the filter.
3.
Faulty diaphragm. Will also cause a
high water rate
3.
Replace the diaphragm
Assembly - Part No 10117534.
4.
Automatic gas valve push rod jammed.
May also cause a high water rate.
4.
Dismantle clean and regrease
using Dow Corning 111 silicone
grease. Handle the push rod
with care, do not bend.
5.
Slow ignition screw incorrectly set. Will
also cause a high water rate.
5.
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.
NO OR LOW WATER FLOW
RATE
1.
Blocked water filter.
1.
Clean the debris from the filter.
2.
Heat exchanger blocked with lime.
2.
Descale or replace - Part No
10/17758.
3.
Loss of service water main pressure.
3.
Contact your Local Water
Authority.
4.
Low water pressure.
4.
Check that the low pressure
inlet has been used and that the
low pressure throttle kit (P/N
31/17756) has been fitted.
HIGH WATER FLOW RATE
See
LOW WATER TEMPERATURE
HIGH WATER TEMPERATURE
1.
Automatic gas valve push rod sticking.
Water rate will be normal.
1.
Dismantle clean and regrease
using Dow Coming 111 silicone
grease. Handle the push rod
with care, do not bend.
