Code and description Cause Measure
F02 (lock out error)
Fan fails to run at correct
speed.
Defective motor and/or rotor. Check the motor and rotor
Replace the fan if the motor or rotor is
defective.
Reset controller
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•
•
Damaged wiring Check the wiring between the fan and the
controller.
If any wires are damaged, the wiring
harness must be replaced.
Reset controller
•
•
•
Contaminated or blocked fan Check if the fan is dirty and repair it if
necessary.
Check that the rotor can rotate freely
Reset controller
•
•
•
Because of a drop in the supply voltage,
the fan will not run at the correct speed.
Check the supply voltage, this must be
230 VAC(-15%, +10%)
Reset controller
•
•
F03 (lock out error)
The pressure switch fails
to work correctly
Damaged wiring/Open circuit Check the wiring between the pressure
switch and the controller
If necessary, replace the wiring
•
•
Pressure switch not closing Check the speed of the fan (see section
12.1).
Check that the hoses on the pressure
switch and the air supply hose between
fan and burner are correctly fitted. Refit
them if necessary
Check for cracks in the hoses on the
pressure switch and in the air supply
hose between fan and burner. If
necessary, replace the hoses.
Check whether the chimney flue is
compliant.
Check for blockage in the chimney flue.
Remove any blockage that may be
present
Check for blockage in the condensation
water discharge.
Remove any blockage that may be
present.
Measure the pressure differential across
the pressure switch.
See the table (see section 12.1). If there
is insufficient pressure differential, clean
the heat exchanger. If the pressure
differential is acceptable, check that the
pressure switch is closing, using a
multimeter
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0311704_BFC_28-120_III_ENEN_V2.4, 2022-10-17 93
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