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Sears garage door opener runs 3 seconds then reverses

Posted by bighank (My Page) on
Sat, Jul 14, 12 at 20:59

Have several Sears garage door openers. Old style not rolling code. Models 139.53400, 139.535006, 139.536006.
All have the 12 pin electronics module with receiver and 4 or 5 terminals going to wired controls.

The 139.53400 will start to run and after about 3 seconds it reverses, runs another 3 seconds in the reverse direction, then shuts off. Problem is NOT with the limit switches as the motor is in between the open and closed points and is not shutting down by contacting the contact on the limit switch.

Have tried 3 different PC boards and get the same results. When using the PC boards on different similar Sears openers (see models above) the boards work fine and the openers travel to the limit switches before shutting off.

Since most of the electronics is on the board except for the limit switches and actual motor windings and the capacitor do not see what is causing the motor to reverse. This unit is sitting on the garage floor and has no load or anything that could cause a bind. When the motor runs it does so at normal speed.

What could cause the motor to stop and reverse after running for only 3 seconds?

Have rebuilt these openers for years but this one has me stymied.

Follow-Up Postings:

RE: Sears garage door opener runs 3 seconds then reverses

Found other posts where the opener ran a few seconds then reversed. Pointed to the RPM sensor at the end of the motor shaft. Looked and found that the C clip holding the shaft toward the RPM sensor was loose and the slot for the C clip had worn allowing the shaft to slide back toward the motor housing. Added a thicker washer and replaced the C clip but the motor still cycles. Think the infra red sensor has been damaged.
Will use this opener for junk parts.

RE: Sears garage door opener runs 3 seconds then reverses

Don't openers have both a limit setting and a force setting? You mentioned that the limit setting is OK. Have you checked the force setting. Maybe something is binding causing the opener to reverse travel.

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