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Fault Finding - Page 20
SYMPTON
PILOT LIT BUT MAIN BURNER WILL
NOT LIGHT ON WATER FLOW
NO OR LOW WATER FLOW RATE
HIGH WATER FLOW RATE
HIGH WATER TEMPERATURE
LOW WATER TEMPERATURE
POSSIBLE CAUSE
1.
Gas inlet pressure low.
2.
Low water flow caused by blocked
water filter.
3.
Faulty diaphragm. Will also cause
a high water rate.
4.
Automatic gas valve push rod
jammed. May also cause a high
water rate.
5.
Slow ignition screw incorrectly set.
Will also cause a high water rate.
6.
Thermostat throttle stuck in the
open position. Will also cause a
high water rate.
1.
Blocked water filter.
2.
Heat exchanger blocked with lime.
3.
Loss of service water main
pressure.
See LOW WATER TEMPERATURE
1.
Automatic gas valve push rod
sticking. Water rate will be normal.
2.
Thermostat bellows perforated.
1.
Temperature selector set to '1'.
2.
Gas pressure too low.
SOLUTION
1.
Call in your local British Gas
Region
2.
Clean the debris from the filter.
3.
Replace the diaphragm Assembly
- Part No 10/17534.
4.
Dismantle dean and regrease
using Dow Corning 111 silicone
grease. Handle the push rod with
care, do not bend.
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.
6.
Descale, regrease and replace 'O'
rings as necessary.
1.
Clean the debris from the filter.
2.
Descale or replace - Part No
10/17667.
3.
Contact your Local Water
Authority.
1.
Dismantle dean and regrease
using Dow Corning 111 silicone
grease. Handle the push rod with
care, do not bend.
2.
Replace thermostat assembly -
Part No 10/13486.
1.
Turn selector to '5'.
2.
Check and clean gas filter, also
check gas inlet pressure.
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