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15.0 FAULT FINDING
Publication No. 5111811
Check and correct if necessary
1. Flame sensing electrode and lead connections
2. Electrode position
Flame current should be 1 µA approx.
Replace PCB
Replace
PCB
YES
YES
Replace flame sensing electrode
NO
YES
Ensure that mains input
terminal L is Live (230V) and N
is Neutral (0V)
I
Check terminal 1 of ON/OFF/RESET selector is in
connection with PCB - M1 connector terminal 16
Check electrical continuity across terminals 1 & a of
ON/OFF/RESET selector when turned to ‘Reset’ position
Replace ON/OFF/RESET selector
NO
Replace PCB
YES
K
Replace boiler
overheat thermostat
YES
NO
Boiler overheat thermostat
operated or faulty, i.e. continuity
across thermostat terminals
Allow to cool. Continuity
across thermostat terminals
more than 1.5 ohm
J
L
Press the reset button on the flue overheat thermostat. If
the boiler does not relight or repeatedly cuts out check
the operation of the flue system or replace the flue
overheat thermostat. If the flue overheat thermostat has
not been activated see section ‘D’