At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Google Nest thermostats are designed to work with most 24 V systems, even older systems. They work with all common fuel types including natural gas, oil, and electricity.
They don't. And why would you want to trade it out??? You are currently running off the communicating terminals. If you are going to install a nest you will have to match the nest wiring with the legacy/24volt terminals on the furnace control board and likely the outdoor unit will need rewired as well. Not extremely difficult but why??? The nest is not what it's cracked up to be!!
You can pull the nest off the wall. If the fan stops, it's in the tstat. If it does not, likely stuck relay or internal furnace issue. Be sure your fan selector is in the auto position first.
Remove the thermostat from the system (just remove the R wire from the circuit board in the FAU) and see if the problem continues. If it doesn't fix it, the circuit board on the furnace should be replaced (something would be seriously wrong with the controls). If the problem stops and you have a nest thermostat (they do this kind of thing often) talk to Nest customer support, they have a solution using a capacitor. If you dont have a nest, replace your current thermostat as it would be faulty.
Do you have a common wire? The nest thermostat needs the common 24V C wire installed to keep the battery charged fully. Nest should tell consumers of this problem, but they don't. Its required for any powered thermostat. Even the new fancy Honeywells with touch screens etc..
Gotta realize the battery cannot run the display and wifi plus all the sensors for very long.
Make sure you have 24 volts @ the transformer inside the furnace....If you are reading 18V across the Red & Common, try reading across R & anything else ie G, Y, W. If you have 24 volts there, then trace your common wire & make sure it is not splice somewhere in between the tstat & the furnace. If you have any unused wires, hook up the different color wire & make sure you use the same wire for common @ the furnace.
In the path of the flame on the last burner that starts, there will be a small rod. That rod is the flame sensor. Take a scrub pad and polish it. Also check the electrical connection that goes back to the circuit board. Disconnect any ground wire from the circuit board to furnace cabinet, sand it and replace it.
×