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George H.
George H., ASE Certified Technician
Category: Small Engine
Satisfied Customers: 18483
Experience:  ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
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I replaced my Chamberlain battery on Model HD900D, it's

Customer Question

I replaced my Chamberlain battery on Model HD900D, it's functional for about 3 months, them on the screen it's telling wiring is in errror or alignment is in error. Instructions are basic black to black & red to red, they are done correctly. Very basic instructions .
Submitted: 4 months ago.
Category: Small Engine
Expert:  George H. replied 4 months ago.

Hello I will help,

Have the floor sensors been hit moving them out of alignment?

Are the LEDs still on on the sensors?