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Code and description
F02 (lock out error)
Fan fails to run at correct
speed.
F03 (lock out error)
The pressure switch fails
to work correctly
0311767_HWH_32-129_II_UKUK_V2.4, 2020-01-31
Cause
Defective motor and/or rotor.
Damaged wiring
Contaminated or blocked fan
Because of a drop in the supply voltage,
the fan will not run at the correct speed.
Damaged wiring/Open circuit
Pressure switch not closing
Measure
•
Check the motor and rotor
•
Replace the fan if the motor or rotor is
defective.
•
Reset controller
•
Check the wiring between the fan and the
controller.
•
If any wires are damaged, the wiring
harness must be replaced.
•
Reset controller
•
Check if the fan is dirty and repair it if
necessary.
•
Check that the rotor can rotate freely
•
Reset controller
•
Check the supply voltage, this must be
230 VAC(-15%, +10%)
•
Reset controller
•
Check the wiring between the pressure
switch and the controller
•
If necessary, replace the wiring
•
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
99
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