Daikin AT12BV1LS Pocket Manual page 167

Troubleshooting
Check
No.15-2
166
<Propeller fan motor>
Make sure the voltage of 290~380V is being applied.
(1) Stop the operation first and then the power off, and
disconnect the connector S70.
(2) Make sure there is about DC 280 V between pins 4
and 7.
(3) With the system and the power still off, reconnect the
connector S70.
(4) Make a turn of the fan motor with a hand, and make
sure the pulse (0-15 V) appears twice at pins 1 and 4.
If the fuse is blown out, the outdoor-unit fan may also be
in trouble. Check the fan too.
If the voltage in Step (2) is not applied, it means the PCB
is defective. Replace the PCB.
If the pulse in Step (4) is not available, it means the Hall
IC is defective. Replace the DC fan motor.
If there are both the voltage (2) and the pulse (4),
replace the PCB.
PCB
S70
7
6
5
4
3
2
1
∗ Propeller fan motor : S70
Fan motor power supply voltage (310~340V)
P.0V (reference of electric potential)
Fan motor control voltage (DC15V)
Turning speed control voltage (DC~6.5V)
Turning speed pulse input
Si10-417
(R3052)
Service Diagnosis