Hitachi RAS-18YH6 Service Manual page 61

< Reference >
When operation stop with LD301 blinks 12 times, it may be caused by faulty DC fan motor.
In this case, please check CN6 and CN12 connection first. It makes Fan Motor Lock also if those
connectors are in misconnection.
DC Fan Motor has broken invites 1A Fuse burned. Please replace both DC Fan Motor and 1A Fuse
together.
It will makes "Fan Lock Stop" when something has disturb the Fan rotation by inserting materials into
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
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 cause in Fan
Motor problem 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
with compressor when you are servicing this unit.
You can not confirm the coil and wiring of Motor directly due to the built in control circuit in Fan Motor.
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