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Craftsman GDO 139.18873 5 flash signal

Posted by johncan30 (My Page) on
Sun, Apr 20, 08 at 9:36

I have just successfully completed the installation of a drive/worm gear kit. The info in your forum helped with some minor problems, thanks. On retesting the safety items and adjusting the up and down forces the manual suggested that I run the door through 3 or 4 cycles. I did this and the door stopped partway up on the 4th cycle. A green LED flashes 5 times on the back of the unit with a 3 second pause in between flashes. After 20 minutes or so the unit worked again but the flashing continues. Since then I have only opened and closed the door, not running it upand down more than once.
What does the 5 flash signal mean and do I have a problem? Any help would be appreciated. Thanks.

Follow-Up Postings:

RE: Craftsman GDO 139.18873 5 flash signal

After help from another forum I found the LED codes in the Chamberlain website. The 5 flash code means an overheated unit or a bad RPM sensor. I had not properly reinserted the RPM sensor and had corrected that earlier but may not have powered down to reset the sensor, or I had overheated the unit by running it frequently while retseting the safety settings. In anycase I have now unplugged and replugged the power and the LED has stopped flashing. Hopefully that is all, I will wait and see. Thanks for the help a great site.

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