Check SiUS04-924
112 Service Diagnosis
5.1.12 Turning Speed Pulse Input on the Outdoor Unit PCB Check
Check No.15 <Propeller fan motor>
Make sure the voltage of DC 325±50V is being applied.
(1) Stop the operation first, turn the power off, and disconnect the connector S70.
(2) Make sure there is about DC 325 V between pins 4 and 7.
(3) With the system and the power still off, reconnect the connector S70.
(4) Turn the fan motor with your hand to ensure the pulse (0-15 V) appears twice at pins 1 and 4.
If the fuse for fan motor protection has blown out, the outdoor-unit fan may also be malfunctioning.
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 neither the voltage (2) nor the pulse is available (4), replace the PCB.
Propeller fan motor : S70
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