Supplied By www.heating spares.co Tel. 0161 620 6677
28
Part No. 5000893
SOLUTION
POSSIBLE CAUSE
SYMPTOM
PILOT LIT BUT MAIN BURNER
WILL NOT LIGHT ON WATER
FLOW
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. Call in your local gas supplier
2. Clean the debris from the filter.
3. Replace the Diaphragm
Assembly - Part No. 10/17572.
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 the
burner ignition should be
smooth and quiet when a hot
water outlet is opened.
6. Descale, regrease and replace
'O' rings as necessary.
NO OR LOW WATER FLOW RATE
1. Blocked water filter.
2. Heat exchanger blocked with
lime.
3. Loss of service water main
pressure.
1. Clean the debris from the filter.
2. Descale or replace - Part No.
10/17558.
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.
2. Thermostat bellows perforated.
1. Dismantle clean 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.
LOW WATER TEMPERATURE
1. Temperature selector set to '1'/'-'.
2. Gas pressure too low.
1. Turn selector to '5'/'+'.
2. Check and clean gas filter, also
check gas inlet pressure.
Fault Finding
