06-08-2022 05:36 AM
My A/C just cycles on and off continuously. I moved the location of the thermostat, but it has always worked in the past. I only have three wires; Red, Yellow and Blue and the system is only for A/C. I have had the thermostat wired up and on the base overnight, but it still says low battery. The thermostat was completely dead when I hooked it up. Can it be a battery issue. I have it plugged into the wall now and I am going to reconnect tonight. Can it be anything else?
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06-16-2022 03:01 AM
It turns out I only needed two wires for my system, the red and yellow. Since doing that everything is working fine. Thanks for the help!
06-08-2022 09:13 AM
Are you using the C slot on the Nest? This is what gives constant power to the thermostat and hopefully solve the issue.
The blue wire might be the C wire. Red is power and Yellow is the AC switch. It's best if you post pics of the thermostat wiring and the same wires going to the control board near the AC blower motor.
06-08-2022 09:25 AM
Yes, I am using the C wire. I have a red wire hooked up to R, a Yellow wire hooked up to Y, a Green wire hooked up to C and a white wire to W. THis is AC only, so I don't know if the white wire means anything. I have a blue wire that should be the common, but at the air handler the blue wire is wired to the green wire,
06-08-2022 09:32 AM
Its best if you could post a pic of all the wiring at both ends to see what is going on here. Sounds like something might be wired incorrectly..
06-08-2022 09:35 AM
06-08-2022 09:36 AM
Here is the wiring at the Air Handler
06-08-2022 09:45 AM
wow, you have a lot of wiring going on there for just AC. You still need to verify what colors are attached to the control board and follow the wires to the thermostat making sure they match. All those split wires is not ideal. You might even consider a complete rewire.
06-08-2022 09:37 AM
The white cable on the right is going to the thermostat. You can see a yellow, green and red wire coming out of it
06-08-2022 09:48 AM
Thanks. This has always worked in the past as is. I just moved the thermostat from the first floor to the second. Would low battery on the thermostat cause the a/c to cycle on and off?
06-08-2022 09:52 AM
Yes, if the nest is not getting power it will work intermittently. All I would suggest is check the wire your using as the C and check the connection at both ends.... something could have moved since u did move the thermostat
06-08-2022 10:16 AM - edited 06-08-2022 10:17 AM
06-08-2022 10:18 AM - edited 06-08-2022 10:35 AM
Can you take a pic of the Nest screen showing the connected wires? In your case, you should have Y C R G connected if its just AC. W is heat
06-10-2022 11:08 PM
Who is the manufacture and what is the model number of your air handler?
You probably need to install a C wire. One of the symptoms of needing a C wire is the A/C turning on and off.
If the Google Nest THermostat was completely dead, then you will need to replace the AAA batteries with a new set of Alkaline batteries. Do not use Lithium or other rechargeable type batieries.
06-16-2022 12:11 AM
Hey folks,
Thanks for responding, Patrick_Caezza and mikev552.
lfpd42, chiming in to ensure everything is covered here. Have you seen the latest responses above? If yes, have you had the chance to try the suggestions as well as get the necessary information being requested?
Best,
Melba
06-16-2022 03:01 AM
It turns out I only needed two wires for my system, the red and yellow. Since doing that everything is working fine. Thanks for the help!
06-16-2022 10:47 PM
Hey there,
You're welcome and that's awesome! Glad to hear you've sorted it out. Let us know if you have further questions about this.
Best,
Melba
06-20-2022 08:39 PM
Hi,
We haven't heard from you in a while so we'll be locking this thread if there is no update within the day. If you have any new issues, updates or just a discussion topic, feel free to start a new thread in the Community.
Best,
Melba