Ariston ecoCOMBI 27 MFFI Installation And Servicing Instructions page 55

B
IS THE FAN
RUNNING?
YES
IGNITION
SPARKS ARE GENERATED
REGULARLY?
YES
IS THE BURNER
ALIGHT?
YES
IS
THERE STILL
A PROBLEM?
NO
NORMAL
OPERATION
Model 27 MFFI/27RFFI System
NO
DOES CODE
A33 APPEAR?
NO
Replace
the main P.C.B.
1. Check/replace ignition
NO
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
NO
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
YES
1. Table III
YES
1. Check the fan cable
2. Replace the fan
3. Replace the main P.C.B.
NO
55