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SERVICE ENGINEER
GUIDE TO FAULT FINDING
IS THERE 230V ON TERMINAL
S3 OF MAINS INLET PLUG
IS THERE 230V ON TERMINAL 2
OF BOILER STAT (RED WIRE)
IS THERE 230V ON TERMINAL
ON BOILER LIMIT WITH RED AND
PURPLE WIRE.
CHECK FUNCTION OF BOILER
LIMIT THERMOSTAT
(CHECK FUNCTION OF OVERHEAT
INDICATOR LIGHT)
REFER TO BURNER FAULT
FINDING SECTION
CHECK FUSE/EXTERNAL
HEATING CONNECTIONS
CHECK FUNCTION OF
BOILER THERMOSTAT
CHECK CONNECTION
OF PLUGS TO BURNER
CONTROL BOX
BOILER NOT WORKING - ENSURE THERMOSTAT IS SWITCHED ON
YES
NO
YES
NO
NO
NO
YES
YES
YES
IS THE BURNER LOCK OUT
LIGHT ILLUMINATED
IS BLOCKED FLUE LIGHT
ILLUMINATED
REFER TO FAULT FINDING
SECTION
NO