topic Re: Fan won't stop running in Nest Thermostats

Fan won't stop running

KMA — Sat, 04 Dec 2021 15:53:08 GMT

Purchased a home with the Nest. When I manually turn on the heat, it works great, but once it reaches the right temperature, the fan keeps running. The app won't let me turn it off, but only gives me an option to run it for a certain amount of time. Even if I pick the lowest option (15 minutes) after an hour it is still running. The only way to turn it off is to turn everything off, so I can only use the Nest manually. How can I fix this?

Re: Fan won't stop running

sporfrog — Sat, 04 Dec 2021 17:43:34 GMT

There are a few different reasons this could happen. It also could depend on which thermostat you have. (these suggestions are general and not necessarily specific to your thermostat or HVAC equipment)

One possibility is wiring. It could have the G terminal miswired causing the fan to run all the time.
There is a fan schedule in addition to a heat and cool schedule? Check the schedules.
Another possibility is that is is configured so the thermostat starts the fan when heating is started, which some systems need, but many do not (fan is controlled by furnace not thermostat). I'm not exactly sure if this works for Nest Thermostat E, but you can check this in the Google Home App:
Thermostat Settings
Under Device Settings -> Thermostat
Under Equipment -> Heat Configuration
Under Fan activation -> You might need to set to [Don't activate]

Good Luck!

Re: Fan won't stop running

Dstill — Fri, 08 Apr 2022 03:34:43 GMT

My unit is doing the same thing. Have you found a solution?

Re: Fan won't stop running

HouseofMouse2 — Fri, 29 Jul 2022 02:48:07 GMT

My unit just started doing the same thing. Did you find an answer to your question?

Re: Fan won't stop running

ThriMai — Wed, 03 Aug 2022 18:00:50 GMT

Following. Similar issue here. Moved into a home with a Nest, which was working great for the past month, until last night the fan just kept running (on AC) and even after resetting, rewiring, and turning the system to OFF, the fan is still on.

Re: Fan won't stop running

TDB1 — Thu, 25 Aug 2022 16:50:27 GMT

Mine too !?!?!?!?

Re: Fan won't stop running

ceh5155 — Sun, 09 Oct 2022 03:14:57 GMT

We are also having the issue that the fan runs constantly in AC after having to reconnect after changing wi-fi mode. I don't see any good solution in the replies. Does Google respond here?

Re: Fan won't stop running

markemory1 — Sun, 16 Oct 2022 09:43:40 GMT

Same issue here. Any solution yet?

Re: Fan won't stop running

Tarasbelle — Sun, 16 Oct 2022 17:20:11 GMT

Same here and in addition getting not enough power for wi-fi error. It worked fine for A/C and for one day for heat. Followed all the solutions including charging the battery via an outlet but nothing now. Ready to trash this thing!

Re: Fan won't stop running

edhurt29 — Tue, 18 Oct 2022 20:32:21 GMT

Same issue as above. Worked fine for several months but now fan runs almost constant. This is frustrating. I guess no support from google.

Re: Fan won't stop running

MrFreePress — Wed, 28 Dec 2022 22:47:37 GMT

Plus one to this topic. One thing that has changed on my nest, because it's been running flawlessly for 5 years prior, is that after I connected nest to my Google Home automated network and possibly enrolled in some climate control sustainability feature, this is when my fan began running 24/7. Please share when you have a solution and I will as well.

Re: Fan won't stop running

markemory1 — Wed, 28 Dec 2022 23:00:32 GMT

The end result for me was google admitted it was a faulty product. Then tried to have me return the brand “new” $120 product in exchange for a “used” $80 one. Refused to send a new one, refused to give a refund, refused to compensate the $40 difference between a new and used one. So now I have a thermostat that doesn’t work (this was already the second one by the way) and I’m out $120. Worst customer service ever.

Re: Fan won't stop running

MrFreePress — Wed, 28 Dec 2022 23:11:58 GMT

SOLUTION: Disable/Cancel Nest Renew from within your Nest App...

My issue didn't start until recently when adding bells and whistles to an already working system installed several years ago. I ventured down this path when adding Nest to my Google Home automations....The problem is not any google home automation...its within the Nest app specifically...Again, DISABLE NEST RENEW

Re: Fan won't stop running

eric30202002 — Sun, 19 Feb 2023 04:26:13 GMT

My Solution - Get rid of Nest thermostat; it's a piece of crap!

Re: Fan won't stop running

Robertburke — Wed, 22 Mar 2023 15:50:38 GMT

Hello. I am having the same issue. This only started this week...people need an answer

Re: Fan won't stop running

MrFreePress — Thu, 30 Mar 2023 00:27:27 GMT

Turn off all options but basic in your Nest app. I answered with details on another similar thread. Could have been the Eco option--something about giving the utility company or the AI permission to turn hvac on and off at will.

Once I got rid of it it went back to normal.

BTW, mine team fine for years before this issue started and it only started after I decided to be Eco friendly.

Search my alias to locate my detailed post on what I did if you can't figure it out from these notes because it's been 6 months for me and I have no further details.

Good luck

Re: Fan won't stop running

MrFreePress — Thu, 30 Mar 2023 00:29:31 GMT

SOLUTION: Disable/Cancel Nest Renew from within your Nest App...

Re: Fan won't stop running

DCR123 — Mon, 05 Jun 2023 04:21:06 GMT

Same problem everyone else is running into. Is there a Nest fix or just trash it?