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IS THE

AIR PRESSURE SWITCH

ACTIVATED?

YES

DOES

THE SPARK

SEQUENCE

START?

YES

IS THE BURNER

ALIGHT?

YES

HAS THE

BOILER SAFETY

SHUTDOWN BEEN

ACTIVATED?

CHECK

P ON AIR

PRESSURE TEST

POINT

P 0.55mbar

POWER

TO SPARK

GENERATOR?

YES

POWER TO

GAS VALVE?

YES

P 0.55mbar

1 - Check/replace A.P. switch

1 - Check exhaust/air intake

2 - Check venturi & tubes

3 - Check fan efficiency/replace

1 - Check/replace cable

2 - Check/replace P.C.B.

1 - Check/replace spark

generator

2 - Check/replace ignition

electrodes and cables

3 - Check spark gap

1 - Check/replace cable

2 - Check/replace P.C.B.

1 - Check gas supply pressures

2 - Check gas pressure to

burner

3 - Check spark gap

4 - Check/replace gas valve

1 - Check if flame strikes

detection electrode

2 - Check soft-light gas

pressure

3 - Check/replace detection

electrode

4 - Check/replace P.C.B.