Johnson Controls YJHJXH024BARR-FX, Service Manual

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Service Diagnosis
Domestic Air Conditioner
65
7.4.2 Indoor fan motor malfunction
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The rotation speed detected by the Hall IC during fan motor operation is used to determine
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abnormal fan motor operation
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when the detected rotation feedback singal don’t receiced in 2 minutes
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Ƶ Operation halt due to breaking of wire inside the fan motor .
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Operation halt due to breaking of the fan motor lead wires
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Detection error due to faulty indoor unit PCB
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1. Check connector connection.
2. Check motor power supply voltage output (pins 1-4).
3. Check motor control voltage (pins 4-5).
4. Check rotation command voltage output (pins 4-6).
5. Check rotation pulse input (pins 4-7).
Notes:the a/c is electrifying,don’t pull out or insert the terminals of the
motor,else the motor would be damaged
Troubleshooting
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Be sure to turn off power switch before connect or disconnect connector, or else
parts damage may be occurred.
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