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21
PROBLEM CAUSE ACTION
Even though temp.
adjusting knob is
turned to“HOT”
Position, heated
water is not hot
enough due to too
high a water flow rate.
Water regulator is faulty.
Faulty diaphragm in
water control body
assembly.
Incorrect water control
assembly fitted.
Hot and cold water pipes crossed.
Inspect and clean.
Replace with new one.
Replace with correct type.
Check, re-connect correctly.
Even though temp.
adjusting knob is
turned to “WARM”
position, heated
water is too hot due
to a low water flow rate.
Water regulator is faulty.
Water pressure is insufficient.
Water filter is clogged.
Incorrect water control
assembly fitted.
Heat exchanger restriction
(damage or limescale)
Inspect and replace it.
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.
Replace with correct type.
Replace or descale.
Same as the above
conditions due to
long flame.
Too much volume of gas flow/
excessive gas pressure.
Check gas pressure at the heater
and adjust regulator within the
correct range.
Main burner and
pilot flame goes out
during operation.
Combustion spillage safety device
has activated.
None or insufficient ventilation fitted.
Blocked ventilation
Insufficient gas pressure.
Check flue for correct fitting, blockages
or any damage to flue pipe or terminal.
Check for spillage due to the effects of any
fans or adverse weather conditions.
Check the ventilation, referring to the
appropriate standard.
Unblock ventilation, (advise the importance
of ventilation).
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.
Main burner only
goes out during
operation.
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 and
reduced flow rate due to other
cold water outlets in use at
same time as heater.
Water filter blocked.
Diaphragm faulty.
Check gas cylinder regulator for
faults and the supply pipe for
blockages.
Enlarge the gas supply pipe.
Clean them.
Check water pressure at inlet with
water heater in operation.
Plumbing modifications may be
necessary to installation.
Clean or replace.
Replace diaphragm.
21


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