P12 Indoor Dc Fan Error (Dc Fan Motor Model Only - Panasonic 2WAY Multi Technical & Service Manual

P12 Indoor DC Fan Error (DC fan motor model only)

Error detection method
• Open circuits and short-circuits in the indoor control board connector CN333 (red) and CN334 (red) on the
motor side are detected and assessed as faults.
Troubleshooting
1
Any poor connections or broken wires in indoor control board
1-1
Fan motor
connector CN333 (red) and CN334 (red)?
Disconnect indoor control board connectors CN333 (red)
1-2 and CN334 (red). Turn the fan by hand to check if it turns
smoothly?
Check if the resistance between No. 1-2, 2-3 and 3-1 on the
motor side of indoor control board connectors CN333 (red)
1-3 is correct? 28 - 90 model: about 70 - 100 Ω 112 - 160 model:
about 35 - 50 Ω Any ground faults between the cabinet and
No. 1, 2 and 3?10 MΩ or more
Check if the resistance between No. 1-4 on the motor side of
1-4 indoor control board connectors CN334 (red) is correct?
5k to 20kΩ
Connect CN333 (red) and CN334 (red), turn on the power and
use a tester to measure the voltages between indoor control
board connector CN334 (red) No. 2-3, No. 2-4 and No. 2-5.
1-5
Is the pin voltage between 0 and 5 V when the fan is slowly
turned?
Is the voltage between No. 1-2 5 V?
1-6 Check the indoor control board and replace if defective.
● For board and Electrical Wiring Diagram, see Chapter 6.
• Outdoor main board: page VI-2
• Outdoor power board: page VI-3
• Converter board: VI-4
• Indoor control board for DC motor models: page VI-5
• Outdoor Unit Electrical Wiring Diagram: page VI-6
● See instructions packaged with servicing indoor board for procedure on replacing indoor control board.
● 1-3, 1-4
IV–89
Yes Repair
No 1-2
Yes 1-3
No Replace the fan motor.
Yes 1-4
No Replace the fan motor.
Yes 1-5
No Replace the fan motor.
Yes 1-6
No Replace the fan motor.