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22
1. Check the fan cable
2. Replace the fan
3. Replace the main P.C.B.
1. Check/replace ignition
electrode
2. Check ignition cable
3. Check/replace the main P.C.B.
Replace
the main P.C.B.
IS THE FAN
RUNNING?
DOES CODE
A33 APPEAR?
IGNITION
SPARKS ARE GENERATED
REGULARLY?
YES
NO
NO
YES
YES
NO
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.
1. Table II
2. Press RESET
1. Table III
IS THE BURNER
ALIGHT?
BOILER HAS
SHUTDOWN?
YES
YES
NO
NO
IS
THERE STILL
A PROBLEM?
NORMAL
OPERATION
NO
YES
B
Model 24 MFFI/24RFFI System