Page 19
FAULT FINDING - Page 20
10/17572.
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
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 10/17558.
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 clean and
regrease using Dow Corning
111 silicone grease. Handle
the push rod with care, do
not bend.
SYMPTOM
POSSIBLE CAUSE
SOLUTION
LOW WATER
TEMPERATURE
1. Gas pressure too low.
1. Check and clean gas
filter, also check gas inlet
pressure.
2. Faulty diaphragm. Will also
cause a high water rate.
2. Replace the Diaphragm
Assembly - Part No
10/17572.
Page 31 of 35
Mersey Super - Installation & Service Instructions
09/12/2009
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