garage door sensor flashed, need wait 15 mins to close? why?

2LlxxjauSeptember 30, 2013

Need help!

Recently my garage door "red" sensor flashed faster at the beginning, then low, then lower,then I have to wait until 15 mins without no flashing then to close the door!

Below are 2 videos about my flashing sensor problem:

faster: http://youtu.be/Px8kTZ4O8V8
(about 3 flashes in 2 second,)

lower: http://youtu.be/UR5dENOOZgE
(about 3 flashes in 3 second, then later 3 flash in 5 second)

My green sensor is always on, no problem!

The brand of my sensor is "Genie".

What's the problem with my red sensor??

Should I buy a new one ?

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