Daikin FHQ100BUV3B, Service Manual

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Additional Checks for Troubleshooting ESIE05-04
3–54 Part 3 – Troubleshooting
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4.2 Indoor Unit: Checking the Fan Motor Hall IC
Applicable units Units using phase cut controlled fan motor with feedback signal.
Checking To check the indoor unit fan motor hall IC, proceed as follows:
Step Action
1 Make sure connector S7 on PCB 1 is properly connected.
2 Make sure the power is ON and that there is no operation.
3 Measure the voltage between pin 1 and 3 of S7.
4 Turn the fan one rotation with your hand and measure the generated pulses.
5 Proceed as follows:
If... Then...
The measured voltage between pin 1 and 3 does
not equal 5 V Replace the PCB 1.
The generated pulses do not equal 3 pulses
between pin 2 and 3 Replace the fan motor.
The measured voltage does not equal 5 V and
the generated pulses do not equal 3 pulses
between pin 2 and 3 Replace the PCB 1.