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.;
i
15.0
FAULT FINDING
I
J
Boiler overheat thermostat
operated or faulty, i.e. continuity
across thermostat terminals
Allow to cool. Continuity
across thermostat terminals
more than 1.5 ohm
NO
YES
Replace boiler
overheat thermostat
YES
Replace
PCB
K
I
Replace ON/OFF/RESET selector
I
I
Replace PCB
I
NO
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
YES
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'
Ensure that mains input
terminal L is Live (230V) and
N is Neutral (OV)
YES
Check and correct if necessary
1. Flame sensing electrode and lead connections
2. Electrode position
YES
I
ReplacePCB
I
Flame current should be 1 IJA approx.
NO
Replace flame sensing electrode
I
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