Is there voltage DC 15 V between
the connections CNI4:2-3 on the
inverter board? (2), (3)
NO
NO
NO
Is the voltage DC 15 V at the fan
motor's contact?
Replace the control board.
Replace the inverter board.
If the fault remains also change
the filter board.
Defective cable between control
board and inverter board.
Is the voltage DC 15 V on the
control board side after the contact
(CNI3 or 1) has been removed?
(2)
Replace the fan motor.
YES
YES
YES
(2) See next page to check the
voltage.
(3) In abnormal conditions the
voltage is below DC 14 V .
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