Daikin AT12BV1LS Pocket Manual page 168

Si10-417
5.4.15 Hall IC Check
Check
No.16
Service Diagnosis
1. Check the connector connection.
2. With the power ON, operation OFF, and the connector
connected, check the following.
∗Output voltage of about 5 V between pins 1 and 3.
∗Generation of 3 pulses between pins 2 and 3 when
the fan motor is operating.
Failure of (1)
Failure of (2)
Both (1) and (2) result
faulty PCB Replace the PCB.
faulty hall IC
Replace the PCB.
Troubleshooting
Replace the fan motor.
167