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IS THE

AIR PRESSURE SWITCH

ACTIVATED?

YES

IS FLUE

DISCHARGE

NORMAL?

YES

IS THE BURNER

ALIGHT?

YES

HAS THE

BOILER SAFETY

SHUTDOWN BEEN

ACTIVATED?

B063

CHECK

P ON TEST

PRESSURE

INTAKE

P 1.2 mbar

YES

P 1.2 mbar

1 - Check A.P. switch cable

2 - Check/replace A.P. switch

3 - Check/replace P.C.B.

1 - Check exhaust discharge

2 - Check venturi & pipes

3 - Check fan efficiency

1 - Check/replace ignition

electrode

2 - Check ignition cable

3 - Check spark generator

4 - Check ignition electrode

cable

5 - Check/replace P.C.B.

1 - Check power supply of

gas valve

2 - Check/replace P.C.B.

3 - Check efficiency of

gas valve

4 - 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.

HAS THE

BOILER SAFETY

SHUTDOWN BEEN

ACTIVATED?

YES

Shutdown L.E.D. off

fan restarts

FC004Ad