Hitachi RAC-50NH5, Service Manual

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< Reference >
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When operation stop with LD301 blinks 12 times, it may be caused by faulty DC fan motor.
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In this case, please check CN6 and CN12 connection first. It makes Fan Motor Lock also if those
connectors are in misconnection.
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DC Fan Motor has broken when 2A Fuse was burned. Please replace both DC Fan Motor and 2A Fuse
together.
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It will makes ÒFan Lock StopÓ when something has disturb the Fan rotation by inserting materials into
propeller fan or ice has growing inside of outdoor unit by snowing.
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It may make ÒFan Lock StopÓ by strong wind (ex. 17m/sec or above) against the Fan rotation. In this case,
unit will be restart again after a while.
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In case of ÒFan Lock StopÓ even though the DC Fan Motor is rotating correctly, the possible casue is
Fan Motor problem or PQ102 on board or control board problem. Stop after the Fan motor runs 2 minutes,
Fan Motor may be broken.
< Caution >
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Please take care for the electrical shock by high voltage of DC Fan Motor power source which is common
with compressor when you are servicing this unit.
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You can not confirm the coil and wiring of Motor due to the built in control circuit in Fan Motor.