Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+
I hit the button on the wall mount or on my remote and the unit just buzzes and won't open. Sometimes it will open for about 5 days then doesn't work for 20. Any help out there?
I don't know about the ground sensors, I do know they are a safety feature so it won't come down on something if the eyes are blocked. Try replacing the bad "eye"
For the buzzing noise, check the capacitor to see if it has blown out and requires replacement. To test this, you should be able to disconnect the door, open it manually, reconnect the door to the carriage assembly, and close the door using the GDO. The capacitor is only used to give the machine enough power to initially lift the door. It does not use the capacitor to close. Other signs to a blown capacitor is white secretion physically coming out of the capacitor. Get the MFD (microfarad) number range off the capacitor and the voltage (usually 220 volts, possiblye 330.) and find a replacement capacitor for the brand of your opener.
Posted on Feb 14, 2009
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Posted on Jan 02, 2017
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