Hitachi RAM-40QH5 Service Manual page 59

< Reference >
When stop operation with LD301 blinks 12 times, it may be a DC Fan Motor broken.
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In this case, please check CN30 and CN31 connection first. It makes Fan Motor Lock also if those
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connectors are in misconnection.
If 2A Fuse was burned it is possible that the DC Fan Motor may be damaged too.
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DC Fan Motor has broken when 2A Fuse was burned. Please replase both DC Fan Motor and 2A Fuse
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together.
Fan lock detecting system may be actidiated when something has disturb the Fan rotation by inserting
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materials into propeller fan or ice has growing inside of outdoor unit by snowing.
Fan lock detecting system may be actidiated by strong wind (ex. 17m/sec or above) against the Fan
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rotation. In this case, unit will be restart again after a while.
Fan lock detecting system may be actidiated even though the DC Fan Motor is rotating correctly, the
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possible cause is due to Motor problem or PQ102 on board or control board problem.
< Caution >
Please take precaution while servicing Fan Motor circuit, because it carries DC330~360V supply.
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It is impossible to troubleshoot the Fan Motor because its circuit is integrated and conceal in the Fan
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Motor.
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