liftmaster Chamberlain Garage Door Opener Transmitter 300MC Logo
Posted on Aug 17, 2010
Answered by a Fixya Expert

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Power wasw lost to home and after power was restored, the opener normal operations was lost. the opener will only open/close by holding down the button, otherwise the unit only clicks and flashes for a short cycle.

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  • Expert 143 Answers
  • Posted on Sep 04, 2010
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Joined: Jun 06, 2010
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First of all whether you repair or replace get a surge protector on this unit 900 joules or higher and this won't happen again. Either the safety sensors are out of alignment and this is a coincedence to the power outage or the power surge has either affected the logic board or the safety sensors or both. You can test the sensors by running them off of a 9v battery. Thanks BB

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