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How to program a Chamberlain remote to a Automatic Doorman 455?

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Installed two new springs on automatic doorman model 455 and it won't close or open. chain will not move door where are adjustment screws? I think that may be the problem


Does it make a noise? Did it run before you changed the springs? Did you replace springs on opener or on the door? What adjustment screws are you looking for? Do you think they went out of adjustment when you changed the springs?

Sep 04, 2011 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have a Automatic Doorman Model 455, problem is door goes down with no trouble, but lifting it goes about 10" and stops. I have changed the "V" belt, the problem still exists. I did an...


You are probably right about the motor going.Does it get to a point where the door stops and the motor is making a humming sound? If so the motor is going for sure...In the mean time to get you by,try putting more tension on the spring of your door to give the electric door opener a little extra help as its opening.

Nov 15, 2010 | liftmaster Chamberlain Garage Door Opener...

1 Answer

Does anyone know where I can get the 9 tooth chain sprocket (not the one on the unit) for a Doorman 455?


If you are looking for the sprocket that goes on the door end of the T-rail you can call any Chamberlain or Liftmaster dealer in the yellow pages. They might even sell you a used one off an old opener they have changed out.

Oct 08, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

Automatic Doorman model 455 learn button location?


The button should be on the back of the motor unit. You may have to remove a light lens to find it.

Aug 01, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have an Automatice Doorman model 455 garage door opener. I recently changed the battery for its remote control. How do I reprogram the remote control?


Your opener is very old and not only are there no parts available but it is not a programmable system. Your best bet is to buy something more up to date which will be much safer to operate.

Jul 29, 2010 | Sears Craftsman LiftMaster Chamberlain...

1 Answer

I have an Automatic Doorman 455 garage door opener. The door while going down hit the top of a garbage can and instead of going back up, was stuck with motor running for 2-3 mins. before I pulled the plug...


I am assuming that the motor runs but the belt slips (until you give it an assist).
The belt got glazed when it sat there stuck with the motor running, and now it is too slippery.
Take the belt off. If the pulleys have a blackened coating (melted rubber) in the v, you should clean them up. Steel wool works well for that.
You might be able to salvage the belt by roughing up the friction surface with sandpaper (about 100 grit). If the belt is old and has cracks, just buy a new belt.

Mar 30, 2010 | liftmaster Chamberlain Garage Door Opener...

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