How To Test Limit Switches

Рет қаралды 61,055

2 жыл бұрын

Need to know where your limit switches are for your furnace and what they do? Find out what to do if you have already purchased the part and it's still having the same issue! Need help? We've got you covered!
*Do NOT use a lighter to test parts if you are worried you will hurt yourself. Better safe than sorry! Use a heat gun!*

Пікірлер: 37

@joes3662 Жыл бұрын

This information saves lives :D. Great tips!! looking forward to the coil video

@opentopublichvacschool Жыл бұрын

Thank you! We do our best to ensure we can help in any way.

@JohnnieDeLaCruz Жыл бұрын

Great description and details. I work gas service for a utility company and often go out to many homes helping customers keep gas flowing for heat and just advised a customer on this part. In my down time I watch videos to keep my troubleshooting skills up . Looking forward to seeing other videos here Thanks

@JCarlWilson Жыл бұрын

Good information, thanks

@copperkeyracing6167 3 ай бұрын

I love her word usage, funzies, booties, EZ, smouge. Super cute!

@_mikishi_ Жыл бұрын

Thanks for the video

@PuerinTheHunter 4 ай бұрын

Excellent instruction! thanks!

@jeffpriode7514 Ай бұрын

Liked video on how to check limit switch circuit

@explanoit Жыл бұрын

Thank you for video

@sambathbunkh 5 ай бұрын

Great topic nice to see you

@michaelhernandez439 Жыл бұрын

You're explaining tech in shirt sleeve English. Beyond cool ! Thank you !

@opentopublichvacschool Жыл бұрын

Thanks for coming by and leaving a comment! I'm glad that we could help.

@jacobcrosby275 5 ай бұрын

This was awesome

@user-dq8wg8kn4o Ай бұрын

What's the restriction on gas presure ? I thank you for your response 👌🙏🙌🫴🫵🫶 Nice video 👌🫵🫶🌻🌷🌸🌹💐🥀

@josh3386 Жыл бұрын

Thank you for making this! I’m a newer tech and keep getting frustrated and confused what limit is tripping on calls, they all are closed but the control board keeps saying a limit switch is open after it runs for a bit. I was always told if there’s continuity then they’re good. Need to start bypass then one by one to see which one is tripping when it should not be!

@opentopublichvacschool Жыл бұрын

My youtube isn't telling me when I have responses! So sorry for the late reply. Yes, even if it has continuity it can be bad, however, at times it can also mean the high limit is doing it's job and it's just low air flow. Companies like Carrier, or Lennox (although Lennox I've seen can make their manuals more detailed) only say LS on the wiring diagram. It's like...OK, which limit switch? At that point, it is so flipping tedious to have to trace back which one is actually the problem based off of the wiring chart, or just bypassing each one. I swear engineers don't have technicians in mind when they design units.

@christianolsen1256 3 ай бұрын

Thanks!

@jacobbishop686 7 ай бұрын

Thankz,,,sweety,,got my unit,,,😀😀😀😀😀

@user-dq8wg8kn4o Ай бұрын

Hi again , What's the sign of over heating please👌🙏🙌

@jamesbuddy3485 Жыл бұрын

good info thanks i have the GHR26Q3-75-2 lennox limit light came on so i had and changed hi limit and roll ran for a day same thing happened roll not tripped check a-coils very clean new filter i have a broad on the way ? any thing other to check thanks james

@opentopublichvacschool Жыл бұрын

Hi James! Sorry for the delayed response so if you have figured it out awesome! If not, we can look at a few ideas. When you say the limit light came on, what did your fault codes say exactly? Did it say 'High limit or Auxilary limit switch open?' Does it just say limit switch open? Does it stay on for a while and then shut off, or is it faulting immediately? Thanks!

@derekdaling5236 10 ай бұрын

Very informative. I have my inducer randomly starting up during AC season. I’ve jumped all the limit switches and it still happens. I’ve replaced the main board and it still happens. What the heck is telling my inducer to start up? Happens when I only have R and Y jumped too eliminating the t stat. Inducer never ran before during the summer.

@opentopublichvacschool 10 ай бұрын

Does it behave the same way in heating? Usually when you are bypassing limit switches, you need to bypass them on the control board itself. The control board should be flashing a code if it ever causes a failure. Normally when this occurs, it is from an open limit switch. How are you bypassing the limit switches? You mention it ONLY happens when you jump R to Y. So this does not occur when you jump R to G or R to W?

@mikeadler434 Жыл бұрын

👍👍

@wayne7speaks 4 ай бұрын

where can we get the jumper

@jeannogueira5859 6 ай бұрын

Very nice, thank you. My furnace shut off during the cycle, but we lost 24v to the thermostat, then 10 sec. The power to the thermostat is back. Why?

@opentopublichvacschool 6 ай бұрын

There shouldn't be much in like that can intermittently break voltage to the thermostat. The most common culprit would be a bad wire nut, slightly broken wire, or overflow shut-off switch. You'll do best to actually check for the 24V at the furnace when it fails on the thermostat.

@miketrissel5494 5 ай бұрын

Nice presentation. You probably didn't know it, but there was some kind of creepy and distant music that was fading in and out in the background that was very distracting. You might want to re-record this.

@hankus253 Жыл бұрын

Safer than using FIRE would be to use a heat gun. They are more than capable of generating safe high heat.

@opentopublichvacschool Жыл бұрын

Of course! Safety first. This was before I got my heat gun. 100% should always not play with fire.

@vladkantor6156 Жыл бұрын

What , if no coil exists. Just heater?

@copperkeyracing6167 3 ай бұрын

8:17 "You buy a double male for funzies, and then it's super EZ, but sometimes they don't work with big booties." Wow! Seriously!?!?!

@opentopublichvacschool 3 ай бұрын

🙃 That wasn't even intentional, but hey, I'll own it.

@jamesbuddy3485 Жыл бұрын

looks like it was my broad

@VashtheReapr Жыл бұрын

Was she messin with the thermostat 😂😂

@thespanishflyangelmiguelto1797 Жыл бұрын

Lol vash

@copperkeyracing6167 3 ай бұрын

5:17 "Some of them are 7 inches. I've even seen some that are 11 inches... good man has those"... wow, 11 inches!!! That's a good man, indeed! I'm the 7-inch type.