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Old 06-13-2019, 10:02 AM   #1
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Interference with Linear LDO50 garage opener


Hi all! New here, with only basic DIY skills. My house was recently hit by lightning, and it impacted my Linear garage system.

I had to replace the beam receptacles (easy), but now the "learn" light on the unit is constantly flashing, which indicates an interference as per the manual. I can't (re)program any remote, only the wall remote works correctly.

I changed the light bulb, checked potential interferences but without success. Any thought or advice would be greatly appreciated, thanks!
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Old 06-13-2019, 10:25 AM   #2
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Re: Interference with Linear LDO50 garage opener


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Originally Posted by Pingouinet View Post
Hi all! New here, with only basic DIY skills. My house was recently hit by lightning, and it impacted my Linear garage system.

I had to replace the beam receptacles (easy), but now the "learn" light on the unit is constantly flashing, which indicates an interference as per the manual. I can't (re)program any remote, only the wall remote works correctly.

I changed the light bulb, checked potential interference's but without success. Any thought or advice would be greatly appreciated, thanks!
I would unplug the garage door opener for several minutes and see if that clears it.

I have seen garage door openers affected by lightning before. It usually indicates a problem with the home's grounding electrode system. You need to have good tight connections to the water pipe and/or ground rod(s) so that lightning has a low resistance path to earth. Also the ground on the opener electrical outlet must be good. The connections in the electrical panel must be tight.

I surmise that the reason garage door openers are affected is because garage floors are made of concrete in contact with the earth. This is an excellent ground and the rails of the garage door are in contact with the concrete. One installer that I know always adds a plug in surge protector to his installations. That is a good idea, but you still need a good grounding electrode system.
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Old 06-13-2019, 12:10 PM   #3
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Thank you so much for your input. Understood for the importance of a good grounding.
Unfortunately the unplugging didn't solve the issue.
What kind of device/item might be creating that interference? I didn't change any equipment that could explain that sudden change.
Would changing the main unit solve that issue otherwise?
Thanks again for your help!
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Old 06-13-2019, 02:28 PM   #4
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Re: Interference with Linear LDO50 garage opener


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Originally Posted by Pingouinet View Post
Thank you so much for your input. Understood for the importance of a good grounding.
Unfortunately the unplugging didn't solve the issue.
What kind of device/item might be creating that interference? I didn't change any equipment that could explain that sudden change.
Would changing the main unit solve that issue otherwise?
Thanks again for your help!
If you haven't already done so, I would contact the factory. Perhaps a component got fried from the lightning hit.
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Old 06-13-2019, 03:09 PM   #5
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Re: Interference with Linear LDO50 garage opener


Will it not open with the pad or with a wireless remote? If it is the remote then the opener may have lost the key code and you would need to retrain the remotes (and your cars if they have an opener capability).
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Old 06-13-2019, 05:30 PM   #6
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Neither the pad nor the remotes are recognized when I "learn" them. I am suspecting that the interference is what's blocking that signal, but I can't locate what is causing it or how to replace it.
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Old 06-13-2019, 07:15 PM   #7
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Re: Interference with Linear LDO50 garage opener


If you have LED bulbs in the opener, remove them. They are known to cause interference with the wireless signal.
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Old 06-13-2019, 07:20 PM   #8
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Re: Interference with Linear LDO50 garage opener


I can think of only two possible interferences:
1) light beam across the floor. Possibly while working on the opener, you may have hit either the sender or receiver and mis-aligned it. Should be an indicator light on it and when you put your hand in front of the beam, it should change state.
2) Force (current) sensing on drive. Maybe came out of adjustment ? Should be a knob to adjust it.
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Old 06-15-2019, 06:55 PM   #9
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Re: Interference with Linear LDO50 garage opener


Chances are the lightning strike fried the logic board in your opener. Seen it happen a number of times. My own fried when the next door neighbor's house got hit years ago. How old is the opener?
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Old 06-16-2019, 10:32 AM   #10
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That would make sense, since everything I tried for fixing it failed so far. The opener is at least 10+ year old, would replacing the motherboard fix it? Or should I start considering calling a specialist or changing the whole unit?
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