topic Furnace Short Cycling in Nest Thermostats

Furnace Short Cycling

mjgribbins — Fri, 22 Oct 2021 18:48:11 GMT

My nest thermostat is making my furnace short cycle (turning off and on every few seconds). I have the c wire installed. I re-installed my old (non-smart) thermostat and the furnace worked fine.

I checked the connections at the nest base plate and they are pushed in and the buttons are down. I have the G wire, W wire, R wire, and the C wire connected to the correct ports on the thermostat and at the furnance.

My batteries have hovered around 3.0 V, even several hours after the connections were made.

Re: Furnace Short Cycling

Kingfor — Tue, 02 Nov 2021 13:39:34 GMT

Following. The same thing is happening for me. Would like to know if you have resolved the issue.

Thanks

Re: Furnace Short Cycling

fedino82 — Wed, 03 Nov 2021 06:21:46 GMT

Same here with the Nest telling me that the furnace shuts down every 15 mins and to check filters. The furnace does show an overheating error / limit circuit fault code 33.

I changed the filters and had the furnace checked by a technician: he had the furnace running for 2 hours and never stopped nor give an error code.

I then removed the thermostat and connected red and white wires: the furnace works continuously, never stops and no error code.

Hence, this error is caused by the thermostat.

Re: Furnace Short Cycling

mjgribbins — Wed, 03 Nov 2021 13:36:05 GMT

Mine was turning off and on every few seconds. I called customer service and they said I had to hook up the thermostat and call them back, which I've yet to do. I switched back to the old one figuring that cycling off and on every few seconds can't be good for the furnace.

Re: Furnace Short Cycling

DDT1345 — Wed, 03 Nov 2021 22:58:28 GMT

Same issue here. I also can't believe that this is good for my furnace. The relay on the Taco Zone Valve Control board is clicking like crazy...and I have a C-wire installed.

Re: Furnace Short Cycling

Lizzyf — Sun, 19 Dec 2021 11:56:05 GMT

Following. Same and I cannot find an answer

Re: Furnace Short Cycling

ace008 — Mon, 20 Dec 2021 21:21:07 GMT

Same issue here. Eventually in the mornings after a few of these short cycles, I have to flip the breaker to the furnace to work again. I also did a hard factory reset. Before the reset, the furnace would not come on at all.

Re: Furnace Short Cycling

mikep151 — Mon, 27 Dec 2021 17:55:21 GMT

I have the same issue with short cycling. Sometimes the furnace kicks on and runs as it should. Other times it just spools up and then stops over & over again. Batteries are at 3.6-3.83. When it short cycles I have to manually turn the temp down below current room temp until the furnace stops cycling, then turn it back up. Then the furnace will start up. I do not have a C wire, but it sounds like that's not really the issue.

Re: Furnace Short Cycling

carndog — Tue, 28 Dec 2021 11:55:21 GMT

I have the same issue. Using the same nest and system for 4+ years, problem started a few weeks ago. Swapped out the nest for an old thermostat and the short cycling stopped. Almost seems like a software update was the root cause.

Re: Furnace Short Cycling

Bethzdo — Sat, 12 Mar 2022 00:17:08 GMT

My furnace keeps recycling I have even had a new thermostat sent to my and installed it keeps recycling. I went back to my old thermostat. I wish they had a better customer service program

Re: Furnace Short Cycling

Azúl — Mon, 14 Mar 2022 03:12:10 GMT

Same issue. Nest is short cycling, but backup thermostat works fine.

Re: Furnace Short Cycling

WD40 — Fri, 06 May 2022 15:23:40 GMT

Same issue. Returning the Nest--disappointing and a waste of time--and reinstalled the old thermostat which works fine.

Re: Furnace Short Cycling

Kabes — Mon, 30 May 2022 03:20:56 GMT

Same issue here.. Can't figure it out and its driving me crazy. On the phone with google and they suggested i replace it with another one as it may be defective. Returned it and installed another one and same thing. C wire or no C wire it doesn't make a difference, Fed up and Reinstalled old thermostat and going to return the headache.

Re: Furnace Short Cycling

diyx123 — Wed, 19 Oct 2022 15:11:58 GMT

Anyone able to figure out their on/off cycline issues? I also had this issue last year. Turned out it was my water limit guard dog. I'm having other issues now that could be related to the Nest / Taco board. Would be interested in knowing what fixed your cycling issues. Thanks!

Re: Furnace Short Cycling

Steelcards — Fri, 18 Nov 2022 14:45:51 GMT

Same issue, just started...not able to find any answers

Re: Furnace Short Cycling

BirchHill — Wed, 14 Dec 2022 16:16:09 GMT

This is great. No one from Nest or Google replies to anything here.

Re: Furnace Short Cycling

BirchHill — Wed, 14 Dec 2022 16:19:53 GMT

I also had the same issue with a Sensi Smart thermostat. Had to tank it. Don't want to buy a nest if it has the exact same problems as the Sensi. Guess Google expects you to buy products with zero support.

Re: Furnace Short Cycling

Silversmith — Wed, 28 Dec 2022 20:06:42 GMT

Hello, This is an old post, but I'm wondering if you found a solution as I am having the same issue.

Re: Furnace Short Cycling

Steelcards — Wed, 28 Dec 2022 22:09:30 GMT

My issue was with the condensation trap on the furnace. Had someone come out and look at it, they did a little cleaning and routine maintenance, issue wasnt the Nest.

Re: Furnace Short Cycling

Spray — Fri, 30 Dec 2022 13:41:50 GMT

Yea my entire home is brand new so that’s not what it is here