Craftsman 41AC150-1M, 1/2 HP chain drive. Opens OK but when closing it will go some random distance then the light will go off for a split second and power to the chain drive will be cut. The door may coast about an inch at this point or maybe not. No retraction. After the flicker the light stays on. Then I have to wait a random amount of time before it will respond to the remote control again then the problem repeats.
When I press the remote control button the receiver light on the back flickers so it appears to be getting the signal.
The same problem happens using the button on the wall so it is not the remote control.
Both safety sensors have solid green lights all of the time. Blocking the beam causes the expected stop, retract and flashing of the light, so they are working.
Jiggling the wires into the back of the safety sensors does not change the lights - they remain solid green.
Jiggling the wires from the safety sensors into the back of the unit does not change the lights on the sensors - they remain solid green.
Disconnecting the door from the metal shuttle thingy does not solve the problem. The shuttle randomly stops, so it is not a problem related to the door itself.
I plugged the unit into a different outlet and still have the problem so it's not the outlet.
The unit feels quite hot to the touch on the left side of the casing.
When the problem happens the receiver light on the back of the unit does not flash.
Any ideas? Thanks!
UPDATE - the chain was loose. I tightened it and now the problem is worse. When the opener stops the light goes off for at least a minute (before it was just a flicker). Changing the closing force doesn't help.