How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Stephen Cutler Your Own Question
Stephen Cutler
Stephen Cutler, General Contractor
Category: Home Improvement
Satisfied Customers: 2062
Experience:  35 years of troubleshooting construction, remodel, component & material failures. What to do next
Type Your Home Improvement Question Here...
Stephen Cutler is online now
A new question is answered every 9 seconds

Chamberlain Liftmaster Professional 1/3 HP remotes working on and off.

This answer was rated:

I have a Chamberlain Liftmaster Professional 1/3 HP, part #41A5389-1B, which worked fine. It still works fine with the wall/door button, but both of the remotes only work sporadically. You can get it to work if you push the remote button four or five times. So strange that they both have the same issue and went down at the same time?? Any thoughts?

Here is a copy of Garage Doors For Dummies 101:
Auto reverse, and failure to respond to close command, are emergency safety functions. This only happens when the opener thinks someone or something it trapped under the door, or standing in the path of the door while you are trying to close it. There are 3 possible causes.

The 1st& most common way the safety system is fooled into thinking it should not close is misalignment of the safety sensors. They are easily bumped and knocked out of alignment. The safety sensors are located at the bottom of, and mounted to, each side of the track. They must be pointed AT each other with nothing blocking either of the sensors. When properly aligned, you should have a small light illuminated on each sensor. If they are in good alignment, but not lit, check the delicate wires for continuity and firm terminal connections. Check for loose wire connections to the control board.

When this problem occurs the remotes will not work, the door will open, but the door will stop & reverse immediately after activating the wall button down command, or if you are holding the wall button down, which bypasses the safety system, immediately upon release of the button. However, IF the door travels partially or all the way closed and then reverses, look to the 2nd & 3rdpossible causes.

The 2nd cause is the closing force, which is also part of the safety system. It could be set too light and the normal tension of the closed position exceeds what the door believes to be allowable tension. . There should be a dial on the side of your opener that has a downward pointing arrow beside it. Turn this dial slightly, in the direction indicated on the opener, to increase the closing force of the door. If opening is the problem look for the up force dial. Binding of the spring coils on the shaft is a common cause of increased tension. If the shaft is dry, oiling or greasing the shaft will restore normal tension. DO NOT use WD-40! For more on springs see:

The 3rd cause is a malfunctioning travel limit switch. This fails to tell the door it is time to stop, and the opener tries to drive the door into the ground- again exceeding what the door believes to be allowable tension. The travel limit switch-mounting setscrew can vibrate loose allowing it to move or fall off. It's trip finger can break, or the switch can simply fail. The travel limit switch is mounted to the rail about where the trolley is located in the closed-door position.
First take a quick look to see if the travel limit switch is dangling by it's wire. Next confirm the sensors are lit & pointing at each other. If the sensors are aligned, get a stepladder and do a close inspection of the travel limit switch. If it has slipped & moved you will see a mark on the rail where the setscrew was engaged. Reset the switch and tighten the setscrew.


This is caused by cold solder joints on the control board, dusty sensors exposed to direct sunlight. wire breaks making contact during expansion & open during contraction, contacts & connectors between the receiver board and the logic board responding to expansion/contraction/vibration, a disconnected or misdirected antenna , low battery power to remotes, or foil reflecting/blocking remote signals(insulate door with foam/foil.

Customer: replied 5 years ago.
Door works fine other than by remote controls. Any suggestions for remote control failure. Door has no issues when being operated by wall button. Batteries are fine (replaced, then replaced again to be sure). Two remotes, so not a bad remote. Remote works intermittantly, 1 success out of maybe 4 or 5 tries.
If the opener is pretty consistant at doing this, try turning off all breakers EXCEPT the breaker powering the opener. The unplug everything on that circuit EXCEPT the opener. If this corrects the problem, you have some electronic devise creating RF interference. Devises go badover time and you would not be aware that this was happening. If it is not RF interference, not blocked signal, not disconnected antenna, (antenna should be pointing down), then you have a problem with the receiver board.
Customer: replied 5 years ago.
If RF interference, like house alarm system, is there a way to fix? Can't change alarm system... Would rather change garage door openers or transmitters??

Generally, grounding the enclosure of a device, and the use of twisted pair wiring prevents the wiring from picking up the RF & dumps RF that contacts the enclosure to earth ground. Your SS should be grounded. If you track interference down to the SS, look for no ground or lifted ground.
There are aftermarket rolling code receivers, that come with remotes, that hook up to the wall button contacts. This may be a workaround for RF, and definitely a workaround for your opener's receiver board. You can ask about RF & aftermarkets at these links:

$50 to $75

$40- $50

Stephen Cutler and other Home Improvement Specialists are ready to help you