Air Handler Fan Keeps Running With Nest Thermostat Turned Off

Troubleshoot strange heat surgery cooling behavior

Sometimes heating or cooling systems can behave strangely. For instance, you may notice your system is always on, it won't turn along, it turns off and on repeatedly, or it makes strange noises. If so, there may equal a power issue. In some cases, you may need to set u a C wire (also called a common wire) or the Nest Power Connector to help deliver accordant power to your thermostat.

At that place are a number of other reasons why your heating and cooling system mightiness be doing something unexpected.

1. Find the right troubleshooting stairs

• Your system of rules is acting strangely: If you see one of the issues listed below without seeing an error code connected your Snuggle thermostat, continue to step 2 to troubleshoot.
  • Your system is making strange noises: chatter, stuttering, clicking or thumping ‒ this can exist caused by your system turning happening and off rapidly
  • Heat or cooling is always on, and won't turn out
  • Heating Beaver State cooling repeatedly turns on and soured in a short period of time
  • You get word a Delayed or Starts in message on your Nest thermoregulator's CRT screen (for example: "Heating is delayed for 2:30 mins")
  • The system fan is always operative operating theatre won't turn on
  • The system fan turns happening and off repeatedly in a short period

• You see an wrongdoing code on your thermostat or in the app: If your thermoregulator shows an error code that begins with a letter followed by a bi (like N80, W4, or E73), delight attend Troubleshooting Snuggle thermoregulator error codes.
• Your scheme cools when it's supposed to heat, or heats when you want cooling system:
  Go to Troubleshoot when your heat heart heats when it's suppositional to cool.
• Your thermostat temperature changes unexpectedly: If your thermoregulator seems to have a mind of its own and sets itself to a temperature that you don't neediness, you may have an matter with the temperature schedule. Delight see the article about Nest thermostat temperature schedules to learn how IT works and how to seduce changes if needed.
• Your thermoregulator switches to and from Eco Temperature unexpectedly: If you get word one or more of the symptoms enrolled below, please X to Troubleshooting automatic home and twist switching.
  • Your thermoregulator switches to Eco symmetrical though you're home.
  • Your thermostat stays in Eco true if you're home.
  • Your thermostat takes a years to switch to and from Eco.
• Other symptoms: If you're experiencing a heating or cooling issue that isn't included above, visit Google support and try searching our support site for your upsho.

2. Make sure completely thermoregulator wires are to the full inserted

If you chequered the symptom lists in tone 1 above and your symptoms tally, here are some troubleshooting steps you hind end take.

Wiring issues usually occur when you're first installing a Nest thermoregulator. However, they can aerofoil by and by as well, but ordinarily for different reasons.

Turn off power to your organisation at the merge box operating theatre system shift. This will help oneself foreclose damage to your system of rules and help celebrate you safe. Draw off the Nest thermostat exhibit. Check that all connectors that have wires are down (see scene). If needed, re-inset wires so that the connector button stays fully pressed lowered. If the button isn't down, your Nest thermostat won't know there's a wire in the connector. You may need to re-disrobe and straighten the wire ends so that they can be fully inserted into the Nest base's connectors.

3. Check that your system doesn't need maintenance

Hither are some common symptoms that indicate that your system may demand professional alimony:

• Your Nest thermostat screen turns blue when you want chilling or orange when you need oestrus, but your system doesn't deform on.
  • Preeminence: When your thermostat's screen changes color, it's trying to turn your system of rules on.
• Your system works normally awhile after you restart it but indefinite or more odd behaviors traded supra in this article's introduction eventually income tax return.

Test by turning power to your system off at the breaker switch. Wait a few minutes and wrench the power back on. If the issue seemed to secure itself but and so returns after a short patc, your system may need maintenance.

To diagnose possible arrangement maintenance issues yourself, you can install your immemorial thermostat and test your system. This bequeath assistanc you tell if there's a maintenance problem with your system, or if your system simply isn't providing enough mogul to your thermoregulator.

1. Bi off power to your system at the fuse box or system switch.This will help prevent damage to your system and help keep you safe.
2. Uninstall your Nest thermostat.
3. Connect your old thermostat. Use the characterisation you took of your old thermostat's connectors during the installation of your Nest thermostat to help you know where apiece wire should proceed your old thermostat.
   • If your system of rules works correctly with your old thermostat re-installed, then there whitethorn be a wiring or office consequence with your Nest thermoregulator installation. You may motive a common (C) wire or the Nest Power Connector installed. You Crataegus oxycantha be able to connect an existing C wire or install the power connector yourself, merely striking a local pro to install a new C wire and troubleshoot any other issues.
   • If your organization doesn't work right with your old thermostat and you see the same issues you had with the Nest thermoregulator, your system whitethorn need maintenance. Contact a local pro to diagnose and set up issues with your system.

4. See that you have a sympathetic organization

If you connected a Draw close thermostat to an incompatible system you testament likely experience unforeseen behavior. Piece Draw close thermostats work with most 24V systems, on that point are whatsoever system types and some taxonomic category models from various manufacturers that are incompatible. Others Crataegus oxycantha pauperism to own a C electrify or the Nest Index Connector joined to be compatible. See the following article for a inclination of scheme types that aren't Nest harmonious.

Systems and ironware that aren't compatible with Nest thermostats

5. Fix surgery connect a C wire

Pull off your Nest thermostat's display and envision if there's a wire in the C connector.

If at that place's already a wire in the C connector

Sometimes the wire in your Cuddle thermoregulator's C connective isn't properly related to your system or your thermostat.

• Double check that entirely wires are in the right thermostat connectors. Enjoyment your thermostat wiring plot and the picture you took of your old thermostat's wires.
• If your thermostat won't turn on, delight see our troubleshooting top executive issues article.
• If you see an error code or wiring report on your thermostat, please go up to our troubleshooting misplay codes clause.
• If you're still having issues with a conducting wire in your thermostat's C connector, contact a local pro to diagnose your system and check that your C wire is installed right.

If there isn't a wire in the C connector

See if there's a C wire connected to your system's board that you can connect to your thermostat.

1. Monition: High voltage
   Be confident to turn out ability to your home base at the breaker, fuse box OR system flip to protect yourself and service forbid wrong to your arrangement. Your furnace may be in a less accessible place like an attic or cellar.
   • If you'ray comfortable accessing your furnace safely and you're foreordained you've reversed off ability to your whole home, here are a few steps you can bring up.
   • If you'Re not sure that you can safely access your furnace, inter-group communication a local pro in your area to help troubleshoot your issue.
2. Take which wires are connected on your system's control board to see if any of them are connected to the system's C terminal. If so, you buns set the other last of that wire in your Nest thermostat's C connector to see if the strange warming operating theater cooling behaviors stop.
3. If in that location International Relations and Security Network't a wire in the system board's C terminal, continue to the next steps. You can install the Draw close Power Connector or have a professional HVAC technician, such as a section affirmative, install the power connective or a C conducting wire for you.

6. Set up the Nest Mogul Connector

The Nest Power Connector is a power accessory that may be a simpler and more affordable alternative to a C wire. To learn how to put in IT, go to The Snuggle Superpowe Connection.

7. Feature a in favor of instal the Draw close Power Connector operating theatre a C wire

A local pro can install the Nest Power Connector or a popular wire if you don't have matchless already. They can also diagnose and fix issues with your system and check that your Nest thermostat is working properly.

• If you have a spare conducting wire behind your thermoregulator that's not connected to your system, your local pro may be able to use IT as a C wire, which is usually cheaper than running a new wire to your thermostat.
• If you wear't have a spare wire, a localized in favour of may be able to install the Nest Power Connector.It can provide force to your thermostat instead of a C wire. Typically, this is easier and less expensive to install than running a parvenu C wire from your system to your thermoregulator.
• Your topical pro may also be able to run a new wire from your system to your thermoregulator. Costs can vary conditional how difficult running the new wire leave be. Ask your pro for an estimate.

Contact a local pro

Note: Pros are independent companies surgery contractors that Nest whole kit and boodle with to help you install your Nest products. Although they are not employed by Nest, we try to keep off a network of well-rated installers for our customers to work with.

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Air Handler Fan Keeps Running With Nest Thermostat Turned Off

Source: https://support.google.com/googlenest/answer/9235232?hl=en