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Fault Finding Solutions
I
Ensure that mains input
terminal L is Live (230V) and
N is Neutral (0V)
YES
Check and correct if necessary
1. Flame sensing electrode and lead connections
2. Flame sensing electrode position
Flame current should be 1 µA approx.
J
Overheat thermostat operated
or faulty, i.e. continuity across
thermostat terminals
YES
K
Check terminal 1 of ON/OFF/RESET selector is in
connection with PCB - A4 connector terminal 2
Check electrical continuity across terminals 1 & a
on reset selector when turned to the reset position
L
Check continuity of loop on
A10 connector
M
Is there 230V at:
Diverter valve operating head
1.
2.
PCB - A8 connector terminals
1 & 5 central heating function
1 & 3
DHW function
YES
Change motor supply cable
YES
NO
Allow to cool. Continuity
NO
across thermostat terminals
more than 1.5 ohm
Replace main PCB
Replace main PCB
YES
NO
14.0 Fault Finding
Replace main PCB
Replace flame sensing electrode
YES
NO
Replace ON/OFF/RESET selector
YES
Replace main PCB
Replace diverter valve operating head
Replace main PCB
Replace overheat
thermostat
45
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