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FAULT: THE BURNER LIGHTS BUT THEN GOES OUT. THERE IS NO FLAME DETECTED.
Check that the gas taps are
fully
open
Check the gas pressure.
NO
YES
The flame is not spreading across
the whole burner and is not reaching
the sensing electrode. Is the gas
pressure correct?
Is the boiler actually designed for the
gas being used.
Change the gas type for the boiler
(gas conversion kit).
NO
YES
Clean the gas filter.
Clean the burner.
18 Fault Finding
9961
11797
FAULT: NO HOT WATER, BUT THE HEATING IS WORKING
Is the water pressure greater
than 0.5 bar ?
NO
Insufficient water pressure.
The appliance will not operate.
Find out why the pressure is so low.
Is the water flow rate greater
than 1.7l/min. (threshold figure).
NO
Check the cold water inlet filter
for dirt. Is the cold water tap fully open ?
Check the heat exchanger for scaling.
YES
Is flow detector operating ?
NO
Change or clean it.
YES
Check the connectors on the
flow sensor and the control board (PCB).
If the fault persists, fit a relplacement
control board (PCB).
YES