Fault Finding - Page 20
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 water flow 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 10/17534.
4.
Automatic gas valve push rod
jammed. May also cause a high
water rate.
4.
Dismantle dean 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.
6.
Thermostat throttle stuck in the
open position. Will also cause a
high water rate.
6.
Descale, regrease and replace ‘O’
rings as necessary.
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
10/17667.
3.
Loss of service water main
pressure.
3.
Contact your Local Water
Authority.
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 dean and regrease
using Dow Corning 111 silicone
grease. Handle the push rod with
care, do not bend.
2.
Thermostat bellows perforated.
2.
Replace thermostat assembly -
Part No 10/13486.
LOW WATER TEMPERATURE
1.
Temperature selector set to ‘1’.
1.
Turn selector to ‘5’.
2.
Gas pressure too low.
2.
Check and clean gas filter, also
check gas inlet pressure.
Supplied by HeatingSpares247.com
