The replacement 20388R.S circuit board is used for older garage door openers. Only use this board if your part numbers are one of the following 27301R, 20388R.S.
The 20388R.S replaces the old board part number 27301R
When replacing this circuit board you may need to reprogram your remote controls.
This Board Can Only Be Returned In Original Condition Sold Within 30 Days.
Unplug the opener before you install the new board!