The lights on the sensors must be on for the door to operate properly. If the wiring is okay you need new sensors. I don't know what "tension" means but if you have a control that is tough to turn you have additional problems. Might just be time for a new opener.
Answers & Comments
The lights on the sensors must be on for the door to operate properly. If the wiring is okay you need new sensors. I don't know what "tension" means but if you have a control that is tough to turn you have additional problems. Might just be time for a new opener.