I have a Chamberlain LiftMaster Professional Garage Door opener (June 2007) with a wireless keypad to open the door but does not open consistently in cold weather. I would like to install a hardwired "key" solution so that the garage door opens consistently in all weather. Can this be done? Is there a specific cylinder I need to purchase for this task?


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    Keep in mind that a hardwired key means the wires will have to be physically present at that location, so it makes it a very easy target for someone that wants to get in the garage. These keys were common in houses I've seen built in the 80's but I haven't noticed many lately.
    – JPhi1618
    Apr 19, 2016 at 17:08
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    The keypads should be designed to work in all weather, but perhaps your battery isn't up to snuff. Look for batteries designed to deal with cold weather. Apr 19, 2016 at 17:49
  • Look for Lithium AAA or AA batteries. These hold up in cold weather. I use them in outdoor temperature sensors and a gate opener. They are expensive, but they do last a long time.
    – JPhi1618
    Apr 19, 2016 at 18:56
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    You'd need a momentary key switch, with a spring return, so that you can momentarily close the contacts rather than switching them long-term on or off. May 19, 2016 at 23:12

2 Answers 2


Why not grab some interior standard outlet (120VAC), plug a 3 VDC transformer/converter in, and feed the battery connections directly inside the keypad? That guarantees plenty of power and avoids a rather messy job (installing a mechanical momentary keyswitch).


Assuming your opener has the terminals for doing so, to hardwire this you would want either a double-momentary keyswitch, or a housing that takes a lock cylinder and uses its tailpiece to actuate a pair of momentary switches, plus appropriate mounting hardware and wires. The latter gives you more flexibility in picking a cylinder that matches, e.g., your house keys.

I agree that if the battery is good, and is appropriate for that weather, and there isn't an unreasonable amount of radio frequency interference (RFI) with the signal, a decent quality numeric pad should work. You may want to spend more time checking why it doesn't before investing in the wired switch.

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