Said It Here

Ants keeping AC contactor from closing

Ants crawl inside outdoor electrical contactors and block the contacts from closing properly. Cleaning or replacing the part only offers temporary relief unless you treat the entire surrounding soil or area with liquid ant bait spikes to stop them from coming back.

Overview
People affected6 accounts across 3 forums
Workarounds found4 items attempted
Community agreement11 total upvotes

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

4 items+ Contribute

Found another way around this?

Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.

  1. 1
    Treat the surrounding area where the ants are coming from with liquid ant bait spikes.
    Did this help you?
  2. 2
    Trying to knock or bang on the box to get the insect out
    Did this help you?
  3. 3
    Using a block of duct seal compound to fill gaps and openings
    Did this help you?
  4. 4
    Clearing them out with compressed air or wind blasting
    Did this help you?
Tried another approach not listed above?+ Share your workaround ↑

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.

r/askanelectrician2 people · October 2026

“A very large yellow jacket went up into the hole here. I banged on it and a little bit of what looked like Dusty mud came out. I banged on it some more and he wouldn’t come out. Is there any risk that there could be damage going on? If so, can I spray wasp spray up there? Or what is the solution?”source ↗

PacoAmigo777 · r/askanelectrician · 5 upvotes

“Went to unlock it and bam got stung.”source ↗

BigD_277 · r/askanelectrician · 1 upvotes
r/hvacadvice3 people · September 2026

“only to find that ants were preventing the contactor from closing.”source ↗

SeaQuiet4105 · r/hvacadvice · 2 upvotes

“I have had a quite a few calls in my career where they keep coming back you have to treat the whole area where the ants are coming from”source ↗

boomshocka0404 · r/hvacadvice · 1 upvotes

“Treat the surrounding area around the condenser with liquid ant bait spikes or else he'll be replacing/cleaning the contactor again in a few days.”source ↗

GeorgiaCB · r/hvacadvice · 1 upvotes
r/Pestcontrol1 person · October 2026

“I having ants going in and out of keyboard for a while.”source ↗

“I clear the ants inside keyboard by wind blasting. But after a few days it's coming back.”source ↗

“Now I see some ants trail on my desk toward other electronic devices”source ↗

Active-Objective1769 · r/Pestcontrol · 1 upvotes

Where this came up

r/askanelectricianr/hvacadvicer/Pestcontrolelectricalelectronicshome maintenancehvacmaintenancepest controlpeststroubleshooting

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