Another A/C Question

Maybe your drain pan switch is flipping it off to avoid an overflow

I checked this, not the case, though.

I did not see, but I would be lying if I told you I looked very well.

No strange noises from the fan. I will check the capacitor this evening

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contactor in the condensing unit

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Could be, but the inside air handler would still run. My understanding is the air handler is not running.

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I did not see, but I would be lying if I told you I looked very well.

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I would take a second look. If there is one in the secondary pan, i dont see why they would put another in the primary drain line coming off the evap coil, but I'm no HVAC tech. While up there, I would also take a look at the control board on the air handler and see if it has any diagnostic codes. Most of the time its a blinking light.

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check and see if the primary condensate drain coming off the evaporator coil has an inline float switch?

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Definitely check this - if you have an in-line condensate drain float switch shutting the system down you would not necessarily have water in the secondary pan. My old unit did not have one, but my newer unit installed last year has a float switch in the condensate line plus a shut-off/break float switch in the secondary overflow pan.

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Nothing is running when the stat is blinking "cool on", when it was working, after the new stat install, there were no strange noises. When the stat is flashing "cool on" nothing comes on

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Okay, so could be a float switch. As said, I would check again and also see if there are any codes on board. Might also be worth reading the manual for the new stat and see if "cool on" blinking means anything or if its normal. I know on my Sensi stat if the temp is blinking its because its on a 5 mins lockout due to a short cycle.

My upstairs Carrier Infinity system has set off an outside temp SENS ERROR code on the thermostat 3 times over the last year, causing the compressor on the outside unit to not kick on, always late in the day, 3 pm or later on really hot days. Fan blows hot air.

Flipped everything on and off, pulled fuse outside, tried resetting a 1000 times and every time, just starts working again after a few hours.

Finally figured out it's the outside temp sensor getting too hot it can't read. Put an ice bag on the outside temp sensor for a few minutes, boom, upstairs thermostat can see the outside unit again and starts working.

Like someone else said also, when mine works the control board on outside unit has green and orange solid lights. When it's not working, only has solid orange light.

Good to hear!