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PROBLEM CAUSE ACTION
Main Burner ignites
when temp.
adjusting knob is
positioned at
“HOT” but goes out
when turned down
to “WARM” position.
Insufficient water pressure
Water filter is clogged.
Faulty diaphragm.
Restriction in heat exchanger
Check water pressure at inlet to
heater. Check for blockages in
supply line or hot pipes and taps.
If using a pump, check pump for
faults.
Clean.
Renew diaphragm.
Descale or replace.
Main burner fails to
shut off when hot
water taps are
closed.
Dirt on main gas valve seating.
Jammed water regulator.
Contamination in water
control assembly.
Inspect and clean.
Inspect and clean.
Clean or replace.
Main burner flames
are yellow and lazy.
NB Yellow tips on
blue flame may be
normal if appliance
is running on butane.
Partly blocked burner venturis.
(Insects and spiders).
Gas flow rate too high.
Heat exchanger sootted up and
dirty.
Remove main burner and clean as
necessary using stiff brush.
Check gas pressure at the heater
and adjust regulator to the correct
range.
Clean the heat exchanger.
On ignition, the
burner makes an
unusual noise.
(Flash-back).
The position between pilot
burner and main burner is
not close enough.
Gas pressure (flow rate) is
insufficient.
Gas supply line is too small
in diameter. (Insufficient
gas supply).
Partly blocked main burner
Injectors.
Adjust.
Check operating pressure’s at the
burner and inlet pressure test points. Check
the whole gas supply line for blockages
including the gas filter on the heater.
Check the gas regulator.
Enlarge the gas supply pipe.
Clean them.
Even though temp.
adjusting knob is
turned to “HOT”
position, heated
water is not hot
enough.
Gas pressure (flow rate) is
insufficient.
Gas supply line is too small
in diameter. (Insufficient
gas supply).
Partly blocked main burner
injectors.
Low water pressure.
Check gas cylinder regulator for
faults and the supply pipe for
blockages.
Enlarge the gas supply pipe.
Clean them.
Check for restrictions. Improve
pressure at mains.
20
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