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1. Electrical Diagrams

Model 24 MFFI/24RFFI System

IS THE FAN

RUNNING?

YES

IGNITION

SPARKS ARE GENERATED

REGULARLY?

YES

IS THE BURNER

ALIGHT?

YES

THERE STILL

A PROBLEM?

NORMAL

OPERATION

DOES CODE

A33 APPEAR?

1. Check the fan cable

2. Replace the fan

3. Replace the main P.C.B.

Replace

the main P.C.B.

1. Check/replace ignition

electrode

2. Check ignition cable

3. Check/replace the main P.C.B.

1. Check the power supply

of the gas valve.

2. Check for an air

pressure signal

3. Check the gas pressure

on the burner

4. Check the soft-light

adjustment

5. Replace the gas valve

6. Check/replace the

main P.C.B.

BOILER HAS

SHUTDOWN?

YES

1. Table II

2. Press RESET

1. Table III

YES