topic Re: Air conditioner keeps running but not cooling. in Nest Thermostats

Air conditioner keeps running but not cooling.

LilSnot — Tue, 24 May 2022 12:23:14 GMT

We've been having issues with the air conditioning unit fan running but is not cooling the house. I power off the thermostat and the air conditioner and let it set for a while to reset it. When I turn it all back on again everything's working fine again. We had the air conditioning technician out and he went over the whole system. He stated The AC unit is in perfect condition but that Nest thermostats were having problems with low voltage issues. Has anybody else heard anything about this and is there any solution?

Re: Air conditioner keeps running but not cooling.

Ashepherdson — Tue, 24 May 2022 19:47:41 GMT

Just want to confirm the actual condenser unit outside is turning on yet your home is not cooling at all? If this were happening at my home I would check a few different things, being the refrigerant levels in the a/c system, as well as the lines for the a/c all the way to the air handler to see if there's anything frozen or leaking. If the a/c condenser is turning on then your system should be blowing cold air.

Re: Air conditioner keeps running but not cooling.

RRuckus — Tue, 24 May 2022 22:15:42 GMT

Yes, same issue. Just installed a new Google Nest Thermostat (the model using two AAA batteries) to replace an old Nest Thermostat. After install, the Google Nest Thermostat showed "Cooling - Starts in " and would show a countdown for a few minutes. At the end of the countdown, the fan would kick on but the condenser (AC unit) would not start and the thermostat would go back to "Starts in..." and the whole process would begin again. It finally started working normally after I left it alone for a few hours. Then, our HVAC technician came out to install a water safety switch on our furnace and had to turn the power off to do so. After turning the power back on, the thermostat is now doing the same useless cycling. I'm hoping it starts working again after a few hours but this is frustrating.

Our HVAC tech mentioned that he's seen this issue with other Google Nest thermostat installations. Everything I've read on the internet (caveat emptor) points toward a low power issue but this was not an issue with our previous thermostat. I have not found a solution except for hoping it will work after a while, but that's not good enough with summer on the doorstep.

Re: Air conditioner keeps running but not cooling.

Patrick_Caezza — Wed, 25 May 2022 03:50:52 GMT

Do you have a C wire installed?

Nest thermostats are designed to work without a common ("C") wire in most homes. During installation, a small number of customers may find that the Nest Thermostat does not receive sufficient power. The Nest Power Connector or a C wire may be necessary. See g.co/nest/cwire for details.

Re: Air conditioner keeps running but not cooling.

LilSnot — Thu, 26 May 2022 21:27:52 GMT

Thank you very much. That's exactly what my HVAC technician set. He said he sees that the Google nests do that. He mentioned something about low voltage issue

Re: Air conditioner keeps running but not cooling.

mikev552 — Fri, 27 May 2022 19:15:18 GMT

Is the "C" slot being used on the Nest? Low voltage means the internal battery is losing power and not able to charge. If your C-wire is not there then this is most likely your issue.

Re: Air conditioner keeps running but not cooling.

mikev552 — Fri, 27 May 2022 19:12:14 GMT

Its very important your C wire is connected. WIFI like a constant supply of power. This will supply power even when the AC/heat is off.

Re: Air conditioner keeps running but not cooling.

evac18 — Fri, 17 Jun 2022 23:07:54 GMT

I think I'm having the same issue. This usually happens at night - it gets hot during the day and will take a couple of hours to cool down to the preferred temp at night. These nights, we wake up in the middle of the night or morning and the temperature is still a few degrees warmer off the setting and shows it was running the whole time. Turning it off for a while then turning it back on will get the cool air flowing again. When I switch from my gen 3 back to the Nest Thermostat E that my unit came with, it's working again. Were you able to fix this with the C wire like the other posts suggest or did you find another solution? Unfortunately, I can't make any changes right now to test myself.

Re: Air conditioner keeps running but not cooling.

Jeff — Fri, 29 Jul 2022 16:39:17 GMT

Hey everyone,

Things slowed down here a bit, but I wanted to check in and see if anyone was still having an issue here. A couple of members have mentioned ensuring that the C-wire was being used. If you aren't using that wire, that would explain the low voltage problem. If you are using the wire and still see the issue, please let me know and we can look at more resolution steps for your setup.

Thanks,

Jeff

Re: Air conditioner keeps running but not cooling.

Jeff — Tue, 02 Aug 2022 16:34:03 GMT

Hi everyone,

Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.

Thanks,
Jeff

Re: Air conditioner keeps running but not cooling.

evac18 — Tue, 02 Aug 2022 23:03:17 GMT

I'm still having this issue. I switched back to my 3rd gen learning thermostat and made sure the C-Wire was connected this time. I am still having the same issue. Between my last post and now (over a month) the Nest thermostat E was working perfectly. I have been waking up in the morning and the fan has been running all night and the temperature is a few degrees off from the target temp. Again, it is fixed by just changing the temperature up to let it completely stop for a minute and then setting it lower again. I also have a sensor in the bedroom which is what it uses at night.

Re: Air conditioner keeps running but not cooling.

evac18 — Tue, 02 Aug 2022 23:08:15 GMT

I just replied to my earlier post but I wanted to note that my issue is similar to the initial post by lilsnot where it works most of the time (both the fan and condenser are normal) but then sometimes the condenser will stop working until you let it completely turn off then turn back on again.

Re: Air conditioner keeps running but not cooling.

evac18 — Tue, 02 Aug 2022 23:09:17 GMT

As noted below, I made sure the C-wire is connected

Re: Air conditioner keeps running but not cooling.

Jeff — Thu, 04 Aug 2022 22:07:25 GMT

Thanks for the added info, evac18. I'll need to dig a bit deeper on this. I appreciate the extra input and the willingness to work with me on this one.

Thanks,

Jeff

Re: Air conditioner keeps running but not cooling.

Ryan_G — Thu, 11 Aug 2022 10:54:18 GMT

Hey everyone,

I'd like to jump in here and check if you've seen Jeff's response. Let us know if you need more help by replying to this thread.

Thank you for your help, Jeff.

Regards,
Ryan

Re: Air conditioner keeps running but not cooling.

evac18 — Sat, 13 Aug 2022 06:50:38 GMT

I’m not sure if I missed something but Jeff just said he needs more time to look at it. Is there a solution you are referencing, Ryan

Re: Air conditioner keeps running but not cooling.

Ryan_G — Tue, 16 Aug 2022 10:48:35 GMT

Hey evac18,

Thanks for the reply.

Please bear with us as what Jeff has mentioned, he is into checking further details on this issue.

We'll keep you posted here in the thread.

Regards,

Ryan

Re: Air conditioner keeps running but not cooling.

Ryan_G — Tue, 23 Aug 2022 03:52:00 GMT

Hey there,

Thanks for being here in the Google Nest Community.

I'd like to bump in here and make sure that you’ve seen our response.
Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Have a great day.

Best regards,
Ryan

Re: Air conditioner keeps running but not cooling.

evac18 — Tue, 23 Aug 2022 16:24:53 GMT

Hi Ryan,

Are you just pasting this in without reading at all? The last post in this thread was you saying Jeff needs more time to look into this after. You did the same thing before:

Jeff: I'll look into this further

Ryan: Did you see Jeff's response? Is everyone good now?

Me: No, Jeff said he is still looking into it

Ryan: Please be patient, Jeff is looking into it

Ryan: Everyone good? I'm locking the thread.

Re: Air conditioner keeps running but not cooling.

CaroG — Wed, 07 Sep 2022 14:19:27 GMT

I’m having this very same issue. I don’t have a C-wire and have had this problem a handful of times on the 2nd gGen and I’m usually able to fix the issue by popping off the base, charging and reattaching. However, 1 month ago the issue did not resolve so I purchased a brand new 3rd Gen and all I did was popped it into the the same base. It limped for a month in that it would take longer to cool and now it’s doing the same **bleep** thing! Although I appreciate the 24hr Live person support I don’t feel this should be an ongoing issue. Im still within the timeframe for a full-refund. Can someone recommend another smart thermostat? Thanks.