this post was submitted on 04 Sep 2026
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Replaced the capacitor and all has been running cool again for about a week. Replaced my neighbor's too. Theirs stopped working again after 48 hrs. One more replacement on theirs and we're at 72 hrs of runtime since replacement.

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[–] Bluewing@lemmy.world 2 points 7 hours ago

Those caps are easy and cheap to replace. Just be careful about shorting them to drain them.

My heat pump went out this spring. It was blowing 3 amp fuses and I couldn't figure out where. So I had to call the local HVAC repair to come out. It took him 2 hours to trace the short because it was intermittent. I hate intermittent faults.

[–] turtlesareneat@piefed.ca 12 points 17 hours ago

This one makes me a GOD to my friends. One 4th of July ours blew, and we paid a guy like $550 to come put in a new capacitor. And then I googled the cost and, when I woke up from the seizure it gave me, I ordered a few to match my condensers. Now I try to make sure my friends don't have to pay that particular emergency-rate cost.

[–] bbue@lemmy.dbzer0.com 42 points 1 day ago (2 children)

Not pictured was the 3hrs of rechecking the process via YouTube to make sure I wasn't going to electrocute myself. Next I have to clean the coils.

[–] Bluewing@lemmy.world 1 points 7 hours ago

Always wash the coils twice a year! Spring and Fall!

[–] grillgamesh@lemmy.dbzer0.com 19 points 22 hours ago* (last edited 22 hours ago) (1 children)

measure ~~twice~~ 40x, touch once!

after all, one can never be too safe when working with the danger pixies.

[–] altphoto@lemmy.today 5 points 19 hours ago

I work with things that you can only touch once. After that you literally won't want to touch them again. You also won't want to touch anything else 😜. Come to think of it, you won't want or desire anything, think about anything. More love or singing or running or moving much more than a passing twitch every few milliseconds.

[–] Godnroc@lemmy.world 19 points 1 day ago (2 children)

This is one if my favorite fixes. Capacitors are significantly cheaper than a new air conditioner, easy to test with the right multimeter, and so easy to replace that most people could do it with minimum research.

[–] Hikermick@lemmy.world 5 points 23 hours ago

A lot of broken appliances are due to bad capacitors. Sometimes they are easy to spot because they bulge. I was given a large broken television, found a bulged one and had it replaced. Worked for the past 8 years

[–] PlantJam@lemmy.world 2 points 19 hours ago

The last time I had someone look at the AC they suggested a "capacitor saver" for something absurd like $300. Seems like maybe not a great deal after all. Glad I told them no.

[–] bbue@lemmy.dbzer0.com 7 points 21 hours ago* (last edited 21 hours ago)

Bonus pic of the neighbor's

[–] dohpaz42@lemmy.world 7 points 23 hours ago (1 children)

Are these things universal? Or are they specific to each unit?

[–] Bluefruit@lemmy.world 3 points 22 hours ago (1 children)

I imagine that some are interchangable but it would depend on the unit. Some might have different capacitors based on how big the unit is, how old, etc.

Thats just from my limited knowledge of electrical and YouTube watching skills. Your mileage may vary.

[–] bbue@lemmy.dbzer0.com 7 points 21 hours ago* (last edited 21 hours ago) (3 children)

You look up the model and it will tell you the size of capacitor to get. They are like $15 if you order them online

Mine actually had the part listed in a paper inside the unit. Turns out the last AC guy put the wrong size in mine

[–] Bluewing@lemmy.world 1 points 7 hours ago

It was probably just the size he had on the truck. And he wasn't about to go back to the shop to get the right one. He's ain't got time for that shit.

[–] Bluefruit@lemmy.world 2 points 21 hours ago

Lol thats always fun. Nice when the unit actually has useful info to say what's required.

[–] expatriado@lemmy.world 6 points 1 day ago (2 children)

i keep a new capacitor stored in my garage so i don't have to go 2 days without AC each time it goes out (I'm on hot and humid climate) , which is every 24 months on average

[–] Crozekiel@lemmy.zip 8 points 22 hours ago

Just FYI, these should not be failing every 2 years - there is something else wrong causing them to fail.

[–] bbue@lemmy.dbzer0.com 1 points 21 hours ago (1 children)

Yeah, I ended up talking to a tech at a company that makes capacitors and he said that if that happens it might be the coiling and/or compressor involved. These are supposed to last 5 years before failing. I didn't really understand what he was saying, so I guess I'm off to YouTube to look at other repairs

[–] PriorityMotif@lemmy.world 5 points 20 hours ago

You might look into a hard start kit. It's a secondary capacitor and a relay which helps with the extra load at startup. Get the kind with separate capacitor and relay, not the all in one kind.

[–] human@slrpnk.net 4 points 23 hours ago (1 children)

For a second I thought I was looking at one of these.

"Tremors graboid attached to truck axle"

[–] MeatPilot@sh.itjust.works 6 points 21 hours ago

Every time my A/C goes out it's those damn graboids!

[–] InvalidName2@lemmy.zip 2 points 20 hours ago

Did you try turning it off and then turning it back on again?

[–] DarrinBrunner@lemmy.world 3 points 1 day ago (2 children)

What is the symptom that says it's the capacitor? I'm guessing it starts the compressor, so the fan runs but no cold?

[–] Bluewing@lemmy.world 1 points 7 hours ago

If you have multimeter, even a cheap one will do, you can test them. there are you tube videos that can show you how to test them even with a cheap meter that doesn't have a capacitance test setting, just ohms.

[–] TVA@thebrainbin.org 5 points 23 hours ago (1 children)

Usually they bulge and if you know what it's supposed to look like, it's quite apparent that it's dead.

The cap is what's used to provide the power necessary for the initial start, so, it that doesn't happen, it's the quick and easy thing to check (I keep a set of the ones mine takes on a shelf ... 30 for a set of 2 and 10 minutes of time to replace or a small fortune for an HVAC guy to replace)

Your inside furnace fan might still run, but, on mine at least, the outside unit fan doesn't run if the cap is dead

[–] bbue@lemmy.dbzer0.com 1 points 21 hours ago

Pretty much anything - outside fan isn't running? Outside fan is running but air not cool? Obv it can be more, but it's a very cheap first attempt. And cheap enough to keep on hand like you do

[–] Freeposity@lemmy.world 3 points 1 day ago (1 children)

Starting or running capacitor?

[–] bbue@lemmy.dbzer0.com 1 points 21 hours ago

Running I believe