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Chamberlain Garage Door Opener Programs Backward

Posted by jtinpa (My Page) on
Sat, Mar 14, 09 at 18:02

I have a Chamberlain hd900d belt drive operator. The logic board went bad and chamberlain gladly sent me a new one covered under warranty. I installed it and now when I try to program it it appears to be working backward. That is, the black button is supposed to adjust the up limit and the blue button should control the down limit. they work opposite of that. Also the safety sensors reverse the dooor when the are obstructed but they do it when the door is going up and the door reverses and comes down instead of the other way around. I have checked the plugs connected to the logic board three times and everything appears to be correct. Does anyone have an answer for me? Chamberlain tells me that the board may be defective and they are sending me another. What are the odds of the new board that they already sent me being wired backward? Am I doing something wrong?


Follow-Up Postings:

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RE: Chamberlain Garage Door Opener Programs Backward

I don't see how you could have done anything wrong. Sure is a strange problem though.


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RE: Chamberlain Garage Door Opener Programs Backward

I got creative. I reversed the motor plug with a little help from a knife to remove the tit that prevents the plug from being put in backward. Works like a charm! Bizarre but everything is now programmed and my door works great. Since the motor is DC simply reversing the polarity did the trick.


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