I have a Chamberlain HD220 chain drive unit that will not close. Had unit for 10+ years with no other problem.
Push button drive travels 4-6" then reverses. Will do it even if the door is disconnected from drive. If I hold the button in it will close completely with the drive cutting out properly at bottom limit. Door will open freely.
Sensors are clear, lit up showing not interrupted.
No apparent binds on door operation or drive.
Getting light flashing code (listed in manual) of 1up/4 down arrows.

I'm usually pretty good at fixing mechanical problems on overhead doors (some of them big enough for train cars) as that was a pretty big part of my years at GM but never dealt much with electrical malfunctions.

Door/drive is on an out building (unheated) may get used 0 to 4 times a day depending on weather. Weather was in the teens when it failed.

This message has been edited. Last edited by: gjgalligan,

Is there a tension sensor on the lift cables? If that isn’t actuated it’ll stop the door’s travel.

Are the lift cables off track? That can happen if someone lifts the door without the chain released.

No sensor on lift cables.
Lift Cables are good.

Drive does not work properly even when door disconnected from drive.

Don't have a chamberlain, but had the same problem. There was a sensitivity sensor setting up on the motor housing - one for opening and one for closing. I imagine that even with a slight temperature shift it may cause a slight binding of the tracks. That may be enough to reverse the door. I just backed off the close sensitivity setting slightly and all good now.

Adios,

Pizza Bob

Not sure sure if this applies to your model, but I found this with a quick Google search.
https://support.chamberlaingro...es#ErrorCode1UP4DOWN

Diagnostic Code: 1 Up 4 Down
Why the error code is being displayed: The safety sensors were obstructed or misaligned for less than 4 seconds.

Door/Opener Behaviors: The garage door starts in the fully open or stopped position and when the garage door begins to close, it reverses to the open position or the garage door does not move and remains at the open position. The Garage Door Opener will not close, and the opener lights flash or click 10 times.

If no Lights are installed, you will hear the opener click while attempting to flash the lights. If the sensors were temporarily blocked, the Garage Door Opener will function as normal.
NOTE: Any garage door opener or replacement logic board manufactured after February 3, 2022, will no longer have this feature.


Symptoms/Resolution: Review the status of the LED on the Sending (Amber) and Receiving (Green) Sensors to determine the most common resolutions.


Amber LED ON, Green LED Flickers momentarily
Intermittent interruptions - Someone or something passed through the sensors: Normal operation - no action necessary.

Amber LED ON, Green LED slightly flickering
Sensors are slightly out of alignment: Realign the Safety Sensors. The Receiving (Green) Sensor should be solid to indicate they are aligned.

Are your safety sensors mounted to the rails or the garage wall.
Mine were mounted to the rails and got to where they were bouncing around enough to mis-align them. I would get them adjusted then it would happen again. Ended up mounting them on the wall.

Did you try it with the door disconnected from the opener and closed? I've had problems at certain times of day with the sunlight messing with the sensor.

I had a similar issue and it turned out to be some broken hinges. Door opened and closed ok, but there was some binding. replaced the cracked hinges and solved the issues.

Since it does it disconected I would check the obstruction sensors.
Also look for anything in the chain track that could be binding.
A friend just had his stopping and reversing, I went to look at and one of the torsion springs had broken.

quote:

Originally posted by Mustang-PaPa:
Are your safety sensors mounted to the rails or the garage wall.
Mine were mounted to the rails and got to where they were bouncing around enough to mis-align them. I would get them adjusted then it would happen again. Ended up mounting them on the wall.

Drive doesn't do close cycle even when door is manually disconnected from the drive. Hard for me to believe rails move when the door isn't.

You said the sensors are not obstructed. Could they be dirty?

I’ve had mine get wonky with cobwebs or other dirt. Wipe off, all good again.

Place a piece of foil, shiny side flat over the sensors (eyes/windows) and see if the door works.
(think, loopback)

This works on most.

When sensors are out of alignment, malfunctioning or dirty, the drive will start, move a few inches and reverse, wither the door is engaged to the drive chain or disconnected.

https://support.chamberlaingroup.com/s/contact-us


Chamberlain and Liftmaster are the same. You can actually get ahold of a real person, on the tech line. I called about 3 years ago, helped.

I had a similar problem with one of my Liftmasters. Tried everything, nothing worked.

I just happened to stumble across an obscure reference on the internet that said to unplug your motor and pop your GFI circuit. Then reset it and plug the motor back in.

I'll be damned. I've never had a problem with it since following that advice.

Update: Door now works.

Called tech at Chamberlain.
After my run down on problem & what I had tried he had me turn 1 sensor 90* up, other down 90* down. Disconnect sensor wires at main unit for 15 seconds. Reattach wires and return sensors to alignment.
Just like magic the door worked properly.

On phone total of17 minutes as he talked me through it.

Similar issue with an Overhead door unit on the small garage, when this happens its always the sensors, either blocked by something, bad sensor or in my case, wire broke. One of the solid copper wires snapped and then it required me to hold the button to close. It's happened a few times.

Biggest problem fixing it is getting my ass off the concrete and back to standing....

quote:

Originally posted by gjgalligan:
Update: Door now works.

Called tech at Chamberlain.
After my run down on problem & what I had tried he had me turn 1 sensor 90* up, other down 90* down. Disconnect sensor wires at main unit for 15 seconds. Reattach wires and return sensors to alignment.
Just like magic the door worked properly.

On phone total of17 minutes as he talked me through it.

just curious - what does turning the sensors do? what does disconnecting / reconnecting wired do that a power off (remove plug from socket) doesn't do?

Just wondering for future troubleshooting.

Just a guess but made sure I realigned the sensors.

Over time, these can shift slightly, especially in extreme temperatures. Try adjusting the ""down force"" setting on the unit (usually a dial or screw on the motor housing). If that doesn’t help, the logic board could be malfunctioning, given the age of the opener.

I had a similar problem with a unit that would reverse unexpectedly. After trying adjustments without luck, I called in some help. https://unitedgaragedoorrepair...rashed-door-service/ was a great resource. They helped diagnose and fix the issue quickly when I was out of ideas.

This message has been edited. Last edited by: mac_220,