Outside AC unit

[txbowkill]

As stated above check voltage on both sides of contactor. If no voltage on top side, check voltage on control wires going into contactor sides, should have ~24v if the thermostat is calling it to kick on. If you don’t have voltage on control wires replace thermostat battery’s and try again. If you do have 24v on the control wires but the contactor is not closing likely a bad contactor. I recently had same problem and it was battery in thermostat.

edit, looks like basschsr beat me to what I was saying.

[mikeyb_23]

I switched the contactor switch with my second unit and the main unit would not kick on. So I switched the contactor back. When push in the contactor on the main unit it kicks on. The second unit fire right up after I gave them power again. Maybe they require different contactor switches? So, now I need a contactor switch?

[jcoffin]

Had this happen last summer. Ended up being a liquid level switch in the drip pan. Since mine was in the attic it had a switch that cut off the AC when the water from the pan did not drain.

[mikeyb_23]

Had this happen last summer. Ended up being a liquid level switch in the drip pan. Since mine was in the attic it had a switch that cut off the AC when the water from the pan did not drain.

My unit in the attic is still coming on. The fan is circulating air, it's just not cold at all.

[jdavidson]

My unit in the attic is still coming on. The fan is circulating air, it's just not cold at all.

a float switch can be wired one of two ways… shut down the entire system OR shut down outside unit only. Plz ck the system for a float switch. It can be installed either overflow pan or adjacent to main drain opening… OR BOTH
i install 2 switches so look carefully

[mikeyb_23]

And for even some more confusion. The unit is running now. I went outside to double check I was ordering the right contactor switch and the outside ac is running. Will the contactor switch gradually go out? Or is it all or nothing?

[jdavidson]

And for even some more confusion. The unit is running now. I went outside to double check I was ordering the right contactor switch and the outside ac is running. Will the contactor switch gradually go out? Or is it all or nothing?

it’s a drain issue !!!
SLOW drain issue..
the drain backs up and trips a float switch…then gradually the water level drops and the float switch closes and the unit kicks on… then more water is made and the cycle repeats. Absolutely NOT a capacitor or contactor

[mikeyb_23]

it’s a drain issue !!!
SLOW drain issue..
the drain backs up and trips a float switch…then gradually the water level drops and the float switch closes and the unit kicks on… then more water is made and the cycle repeats. Absolutely NOT a capacitor or contactor

Ok, I'll go double check

[mikeyb_23]

it’s a drain issue !!!
SLOW drain issue..
the drain backs up and trips a float switch…then gradually the water level drops and the float switch closes and the unit kicks on… then more water is made and the cycle repeats. Absolutely NOT a capacitor or contactor

The water float is good. I actually just cleaned out that drain about a month ago. My daughter's sink was slow draining from all her hair and toothpaste going down the drain. That unit uses her sink for a drain.

[bbqfan5909]

Mine unit was doing same thing. Blow out your drip lines.

QUOTE=mikeyb_23;n26508959]

The water float is good. I actually just cleaned out that drain about a month ago. My daughter's sink was slow draining from all her hair and toothpaste going down the drain. That unit uses her sink for a drain. [/QUOTE]

[Paycheck]

Ants love to get in the contacts on the switch. The contacts might be dirty if it is working sporadic.

[denimdeerslayer]

You can check to see if the fan motor is siezed up. I've had that happen. Found replacement at Grainger. Otherwise check contacts on switch for fireants or if need to be filed. Just turn off power first.

[tpack]

Lots of videos on capacitor's. Hope that's all it is.