HVAC Experts please chime in

[Shawn1112]

Turned AC on for the first time this year. It turns on runs about 2-3 minutes and shuts off. Turns back on about 5-6 minutes later and does the same. Also the fan is making a noise like its hitting something, but I already 100% confirmed its not hitting anything. Its an older Kenmore from 1991 and has ran flawlessly since we bought the house 15 years ago. Every year I clean the coils, oil the fan, and clean everything else. My uncle who passed away was a HVAC guy and showed me how to do the yearly maintenance on it. Only thing I have changed since last year was install a Nest T-Stat but that has been fine all winter.
Thoughts???

Click to read more...

 

[10sec]

https://inspectapedia.com/aircond/Air_Conditioner_Short_Cycling.php

That has some info about what's happening, but I almost guarantee if you have an HVAC guy over, he's going to tell you that it's too old and you should replace everything.

 

[Shawn1112]

https://inspectapedia.com/aircond/Air_Conditioner_Short_Cycling.php

That has some info about what's happening, but I almost guarantee if you have an HVAC guy over, he's going to tell you that it's too old and you should replace everything.

Thats what I'm trying to avoid, lol. Would prefer to call someone that I know or who comes recommended from a friend.

 

[OffshoreDrilling]

Which fan is making noise, inside or outside?

Is the furnace itself cycling or just the outdoor unit every couple minutes?

Take the thermostat off the wall and jump the red wire to the yellow, does it stay running?

 

[10sec]

^^^He knows a little bit about HVAC, juuuuuust a little

 

[10thSVT_03]

I need an HVAC guy as well. What a pain in the ass

 

[wombat]

Which fan is making noise, inside or outside?

Is the furnace itself cycling or just the outdoor unit every couple minutes?

Take the thermostat off the wall and jump the red wire to the yellow, does it stay running?

Listen to this guy.

 

[OffshoreDrilling]

I’ll do what I can. Got about an hour before I’m on the road out of town.

 

[MrMezger996]

When you say it turns off does the condenser fan shut off as well as the compressor?

 

[MrMezger996]

Which fan is making noise, inside or outside?

Is the furnace itself cycling or just the outdoor unit every couple minutes?

Take the thermostat off the wall and jump the red wire to the yellow, does it stay running?

Careful with colors, blue can be used for A/C also, never know.

 

[Shawn1112]

Which fan is making noise, inside or outside?

Is the furnace itself cycling or just the outdoor unit every couple minutes?

Take the thermostat off the wall and jump the red wire to the yellow, does it stay running?

Shit sorry just saw this, was out working on the pool.
Just the outdoor unit cycles and the outdoor fan is making noise.
Will jump those wires right now

 

[Shawn1112]

Leave yellow plugged in as well and just tap the red in to it?
Or remove yellow and put red in to that terminal

 

[MrMezger996]

Both compressor and condenser fan are cycling on and off? Or does compressor shut off and fan stays on?

 

[Shawn1112]

The whole outside unit shuts down

 

[Shawn1112]

Well I left the yellow plugged in and tapped the red in to it.
Without the T Stat back on the wall the AC kicked on and the fan is no longer making any noises. Will report back in 5 minutes to let you know if its still running

 

[MrMezger996]

I only ask cause not sure what people are adding control wise..... is there a fan cycle control on condenser fan? Is there a low psi switch wired into low voltage circuit?

 

[Shawn1112]

I only ask cause not sure what people are adding control wise..... is there a fan cycle control on condenser fan? Is there a low psi switch wired into low voltage circuit?

Sorry bud but I cant answer those questions. Dont have a clue when it comes to HVAC other than the little shit my uncle showed me years ago.

 

[MrMezger996]

Can you pull control panel of condenser? Look for obvious signs of burned wires etc. you could have an issue with a start/run capacitor. The Comp and condenser fan will runoff that

 

[OffshoreDrilling]

My bets are lost a capacitor and the thing is cycling on internal overload or the POS nest is acting up.

 

[Shawn1112]

My bets are lost a capacitor and the thing is cycling on internal overload or the POS nest is acting up.

Can I leave the red on the yellow to cool the house?
I'm thinking of going to buy a cheap T Stat to see what that does.
AC is still running and fan is not making any noise

 

[MrMezger996]

My bets are lost a capacitor and the thing is cycling on internal overload or the POS nest is acting up.

Ohhh he has a Nest?!?! First problem right there.... rip that shit out!!

 

[OffshoreDrilling]

If it’s still running, the stat is your issue. Put it back on the wall and confirm it acts up again and you have your problem solved.

 

[OffshoreDrilling]

Can I leave the red on the yellow to cool the house?
I'm thinking of going to buy a cheap T Stat to see what that does.
AC is still running and fan is not making any noise

Jumping the red to yellow is what the thermostat controls. When it calls for cooling it makes that connection, when it’s satisfied it opens that connection. You can leave it like that but the AC will not stop running until you disconnect the wires.

 

[Shawn1112]

Jumping the red to yellow is what the thermostat controls. When it calls for cooling it makes that connection, when it’s satisfied it opens that connection. You can leave it like that but the AC will not stop running until you disconnect the wires.

Thank you sir!!! I owe you a beer or 3 if we ever meet.

 

[OffshoreDrilling]

Thank you sir!!! I owe you a beer or 3 if we ever meet.

As long as I don’t have to put my grubby paws on it, don’t mind helping at all. Enjoy your weekend!