AC Blown Fuse Low Voltage Short

I am on a no ac service call where the thermostat is blank. I have no 24 volts at the stat. I first notice that the air conditioning systems 3 amp fuse blown. Therefore, I troubleshoot the HVAC system's low voltage wires. The 24 VAC compressor contactor test to ground. Next, I replace the shorted contactor and test the ac system. Unfortunately, I wired the system out of phase and the blower spun backward. After fixing the phasing the system started cooling.

[@jericosha2842]

As a newer tech I greatly appreciate you documenting this stuff and talking through it. Thank you sir.

[@randybethune5854]

Dude just take a picture. Or use wiring diagram. This is not a complicated circuit. Never lay screws or tools on top of unit. Make it as easy on yourself as you can.

[@thehvachacker]

No diagram completely worn out. Usually I take a photo.

[@policegaming101yt2]

Love the videos keep up the great work! Stay safe out there! I personally think your videos are educational.

[@user-vb8jl6nf4k]

Very

[@user-or1uu7yt9n]

You don't want to wonder what will happen to the camera if you get lit up like a Christmas tree !! LOL!

[@calebburns4346]

I try real hard not to pull any wires from the contractor until I have the new one mounted in. Then I swap em. Just makes me more comfortable that I'm not gonna miss something.

[@1keykneedeep]

Pull the contact mount bolts and slide the new 1 behind the old 1. No guessing games. Good work bro

[@reyanshtomas7890]

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[@adrianleandro4315]

@Reyansh Tomas instablaster ;)

[@reyanshtomas7890]

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[@reyanshtomas7890]

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[@adrianleandro4315]

@Reyansh Tomas No problem =)

[@Ted_E_Bear]

You’re the greatest ! Stay safe and healthy and away from the Bat Flu !

[@andrewmacdonald9166]

Great video as always. But it baffles me how tangled and messy the wiring is

[@joshuabest100]

Good quick diagnosis great job pal

[@deloct]

Another great educational video. Thank you for sharing your knowledge. 👍

[@thomasprice7266]

he just rips off the wires and here I am taking off one wire at a time and reconnecting it to the new contactor hoping nothing pulls off in the process.

[@thehvachacker]

I started off doing the wire for wire. Many techs do it their whole career. The schematic is a map if you ever forget where a wire lands. Every wire has a load on the other end. The other day I did 2 contractors same unit. To save time I did the wire for wire. It was a unit I don't work on often and 3:30. Do whatever your comfortable. If you seen my latest video I remove a board and wire the unit using a relay. Spend time on maintenances getting more comfortable reading the schematics and tracing wires. I have been doing this since 1999. Many contactors I replaced. Some missing schematics and I wish I did wire for wire.

[@michaelcostello6991]

@@thehvachacker Can you do a short video to support your other video, replacing the board with a contactor showing a schematic to explain the wiring. This would be extremely useful for HVAC newbies or non electricians.

[@thehvachacker]

Yes I can do a vid writing up a schematic explaining more detail of the vid where I required the air handler controls

[@michaelcostello6991]

@@thehvachacker That would be great if you can post that so I understand better

[@AG-tg9in]

1:57 it’s actually best if you put it on the common side of the transformer I’ve learned that because not all low voltage is grounded you might miss one 😉 good video though as all the other ones you make. Lol I gotta eat every time I see these videos it’s a habit and not a good one too lol 👍

[@Eddy63]

The Hackster ... Doing what he do ... Good vid ...

[@jasonjohnsonHVAC]

I'll pull those resetting fuses from an old rtu that's been replaced and save it for something like this. The lil popper is ok, but it can let quite a bit of current through before tripping

[@jjjames5089]

Testing to ground for shorted windings in a transformer will lead to inaccurate results, unless specifically checking the transformer to see if the windings are shorted to the frame of the transformer. I believe this is correct. Help me out.

[@jjjames5089]

If the transformer is grounded on one leg, then you could accurately check it to see if the windings are shorted to ground.

[@tntheatingandairllc]

Great great job bro keep up the good work out there 👍👍

[@ralphruiz1066]

What size popper do you use? 5 amp 3 amp? Most of the boards i work with use 5 amp fuses but have heard people burning transformers on the 5 amp poppers because they don’t trip fast enough.

[@thehvachacker]

3 amp is better protection for the transformer. I replace the 5 amp fuse with 3 amps whenever I install a split.

[@ralphruiz1066]

@@thehvachacker thank you so much

[@r3d33m3dn78]

Just replaced a transformer with in line 5amp fuse. Never blew, only glowed.

[@aaronclark1599]

Check the coil on the contactors that's probably the problem

[@dperez-tv1lr]

12:36 that's what she said

[@vandenboschtechniek]

Great video again ✌️

[@jeremykillebrew5232]

What’s that 3 wire jumper? Did you make that?

[@matthewgregory8218]

So you were saying California’s condensers are the same as Ontario’s but it hase to work longer right ?

[@mrgreen9086]

Good stuff 👍

[@davidaguilar5921]

You no your shit bro I would of just change the whole unit lmao

[@donnierobertson3088]

Good

[@FranciscoHernandez-gt8ne]

Good Shit!

[@migosmadeira9892]

I have an old Bryant air handler, I don’t see a 3 amp fuse inside, no circuit board either. AC wont turn on I’m sure is shorted something . I used a jump wire to bypass the thermosthat. The A C was working before I did the bypass.

[@migosmadeira9892]

Any idea which part in the air handler I should check ? There’s no circuit board and fuse , note: the A C was working until a bypass the thermosthat . I used a paperclip and I must have contacted a wrong wire. Any idea what part to check that shorted when. I did the bypass?

[@etlawson6939]

@@migosmadeira9892 it has been a while but you probably jumped the 24v to ground.

[@garyperger7262]

Kick ass

[@initiate0461]

Most likely contactor

[@jamespenney4128]

I never wore the mask. If they want the heat fixed, they better deal with it. And they did. The beauty of self employment

[@aaronclark1599]

Hey man I've got a question so on my electric heat circuit board it has a blown fuse so I took off all the thermostat wires put a new fuse in and it pops right away nothing's grounded and there's no low voltage short and all the thermostat wires is unhooked and it's still popping so would that be a bad board? All my voltage readings are correct