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Where does the wires hook from motor to where? Automatic Doorman 455

Hook them up and it kicks the circuit breaker

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Is the door opener motor bad? You say, "the wires"--is there a plug on the end of the wires that can be plugged into an outlet? If so, thy plugging it into an extension cord instead of the outlet in the garage ceiling and see if you still trip a breaker. If you do, it's a problem in the opener. There are things to do to locate the source of the problem. It the breaker trips instantly when you press the button then there's a dead short somewhere. Does the motor get warm or hum before the breaker trips? If so, then maybe the door mechanism is locked up and the motor cant turn. Did you check to see if your garage door is locked?

Posted on Nov 26, 2014

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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on Oct 06, 2010

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SOURCE: installed two new springs on

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?

Posted on Sep 06, 2011

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Breaker keeps tripping when water pressure switch kicks in


I don't know what the pressure switch operates, but I suspect when the pressure switch is actuated, it turns on a pump or a similar load. The breaker is reacting to the load after the pressure switch - not the the pressure switch itself. The switch doesn't make use of electricity - rather it stops the the flow of it, or sends it to something that makes either heat, light or magnetism (as in a motor).

Look at the load that is supposed to start or shut off when the pressure switch "kicks in" There is likely a problem with it - anything from a jammed pump, shorted winding in the motor, water in the motor, crushed / shorted wire, etc.

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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...

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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.

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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.

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1 Answer

Everytime my central air unit kicks on my circuit breaker trips. It didn't do this last year or even earlier this year


A circuit breaker 'tripping' everytime the AC unit kicks on 'most always' indicates a direct short (somewhere in the condensing unit), although it is possible that the breaker itself is bad - (but not likely).

Usually the cause of this 'short' will be - either the condenser motor in the condensing unit (outside unit) or the compressor - also in the condensing unit.

If you're mechanically inclined - and "very careful" around electricity - there is a fairly simple way to find out which component is causing the short.

Step 1 - Make sure the condensing unit (outside unit) is completely disconnected (electrically) , i.e. pull the fuses/turn off circuit breaker on outside unit and turn off thermostat.

Step 2 - disconnect the condenser motor (this is the outside fan motor). Note: when you disconnect the wires of the condenser motor "be sure" you mark/write their location, and wrap them in electric tape.

Step 3 - start the AC unit. If the breaker trips again you can pretty much rest assured it's the compressor that is shorted.

To prove it (without a doubt) - go to next step.

Step 4 - "be sure circuit breaker and thermostat is turned off" - and - 'reconnect' the condenser motor - and - then disconnect the compressor wires (mark wires and tape them).

Step 5 - Start AC.

If breaker doesn't trip - you know it's the compressor that is shorted.

If breaker 'does' trip again - then it's possible the breaker itself is bad (not likely) or there is a 'short' in the condensing unit's "wiring" somewhere (not likely).

My guess is that either the condenser motor or compressor is shorted.

Hope this helps.

Good Luck!

Jun 10, 2010 | Heating & Cooling

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