Hitachi RAD-18NH7A Service Manual page 74

< Reference >
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
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connectors are in misconnection.
DC Fan Motor has broken when 2A Fuse was burned. Please replace both DC Fan Motor and 2A Fuse
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together.
It will makes "Fan Lock Stop"when something has disturb the Fan rotation by inserting materials into
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propeller fan or ice has growing inside of outdoor unit by snowing.
It may make "Fan Lock Stop" by strong wind (ex. 17m/sec or above) against the Fan rotation. In this case,
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unit will be restart again after a while.
In case of "Fan Lock Stop" even though the DC Fan Motor is rotating correctly, the possible casue is
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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 >
Please take care for the electrical shock by high voltage of DC Fan Motor power source which is common
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with compressor when you are servicing this unit.
You can not confirm the coil and wiring of Motor due to the built in control circuit in Fan Motor.
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