How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the leading thermostat manufacturers, and we proudly install them on a regular basis in Charlotte. They’re durable and dependable. Also, Honeywell is frequently enhancing its technology, resulting in more features for your residence.

Nevertheless, each thermostat can have issues every now and then. Due to this, we’ve prepared this valuable manual to go over troubleshooting.

While you can typically fix many thermostat troubles by yourself, they occasionally call for Expert assistance. Our heating and cooling pros are available to help when you need us. We’re just a call away at 704-705-8135.

Let’s get started with the process by finding out what kind of thermostat your residence has.

What Kind of Thermostat Do I Have?

There are three models of thermostats:

  • Manual—This is the classic dial-shaped thermostat. You won’t experience error codes with this one, but it’s also the least efficient for reducing utility bills.
  • Programmable—This thermostat has a digital screen and arrows you touch to determine your desired temperature. You can also choose daily programs to decrease the temperature when you’re gone and increase it when you get back.
  • Smart—You won’t have to set any programs on this thermostat, as it learns your schedule. It instinctively raises and lowers the temperature when you or family members are away to help you save on heating and cooling costs. You can also adjust the temperature anywhere using your phone or other Wi-Fi-enabled device. 

As you’re aware the majority of technologically advanced things, there are regular problems that may happen. The majority of of these situations don’t require Expert assistance and are uncomplicated enough to repair on your own.

Common Honeywell Thermostat Problems

All thermostats have an exclusive kind of codes matching the issues that occur.

Think how simple it can be to fix a computer by restarting it. In many instances, troubleshooting a thermostat can be just as simple.

Here is a listing the most reported Honeywell thermostat issues. These apply to the following programmable thermostats:

Display is Blank

If the screen is empty on your programmable thermostat, you could need to install new batteries. If that doesn’t solve the malfunction or you have a smart thermostat, there might be a wiring malfunction.

Next, you should make sure the power is on for your furnace or air handler. Verify the switch by the indoor equipment is in the “on” position.

In addition to that, you should make sure all furnace cabinet or air handler doors/panels are tightly in place.

An unsecured panel may trigger the safety switch, which disconnects power to the system.

Infrequently, a clear display can mean you should install a new thermostat.

Comfort Unit Won’t Turn On

Ensure that your thermostat is on “cool” or “heat,” not “off.”

During warm weather, make sure you set the thermostat lower than the current temperature. When it’s cold, verify it’s higher. This sounds absurd, but we’ve seen it take place many times.

Make sure the power switch by your indoor system is in the “on” position. You should also check the cabinet doors or panels are closed on your furnace cabinet or air handler. An open panel can trip the safety switch, stopping power to the system.

Heating or cooling still won’t start? Make sure circuit breakers haven’t tripped and that your HVAC unit isn’t showing error codes.

“Cool On” or “Heat On” is Flashing

To start, verify your thermostat is switched to “cool” or “heat.”

Then, verify it’s telling the right equipment to start. This is often demonstrated by “cool on,” “heat on” or an icon.

If this set of words or the illustration is flashing, your thermostat is in a five-minute delay status. This feature keeps your equipment from bad short cycling. This can take place if your power is interrupted.

Honeywell Thermostat-Specific Error Codes

Honeywell Lyric™ T5 Wi-Fi (RCHT8612WF/RCHT9510WFW)

  • 164—Heat pump must be serviced. Call Komfort Air at 704-705-8135 for support.
  • 168—Wi-Fi radio error. Call Lyric technical support at 800-633-3991. 170—Internal memory error. Reach Lyric technical support at 800-633-3991.
  • 171—Set date and time. Complete these settings so scheduling can take place.
  • 173—Thermostat temperature sensor error. Call Lyric technical support at 800-633-3991.
  • 175—AC power resumed. No action required.
  • 181/182—Replace air filter. Clear the screen by hitting “dismiss” after installing a new filter.
  • 184—Install a new humidifier pad. Clear the thermostat by tapping “dismiss” after adding a fresh pad filter.
  • 185—Install a new dehumidifier filter. Clear the monitor by tapping “dismiss” after putting in a fresh filter.
  • 187—Wash or put in a new ventilator filter. Clear the thermostat by touching “dismiss” after installing a fresh filter.
  • 188/189—Replace UV bulb. Ring Komfort Air at 704-705-8135 for help.
  • 210—Register online for exterior temperature. Get the Lyric app to finish this step and ensure proper thermostat operation.
  • 388—Register online for remote access and outside temperature. Get the Lyric app to finish this step and ensure proper thermostat operation.
  • 399—No Internet. Verify your network settings.
  • 400—No Wi-Fi signal. Wait for the thermostat to reconnect or select new Wi-Fi network.
  • 508—Wi-Fi not set up. Download the Lyric app and follow the steps to link your thermostat.

For more information, check this thermostat’s user manual.

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005) 

  • 164—Heat pump requires service. Reach Komfort Air at 704-705-8135 for help.
  • 168—Wi-Fi radio error. Contact Komfort Air at 704-705-8135 for help.
  • 170—Internal memory error. Reach Komfort Air at 704-705-8135 for help.
  • 171—Set date and time. Complete these settings so scheduling can run.
  • 173—Thermostat temperature sensor error. Reach Komfort Air at 704-705-8135 for assistance.
  • 175—AC power reconnected. No action required.
  • 177—Indoor temperature sensor error. Reach Komfort Air at 704-705-8135 for help.
  • 178—Outdoor temperature sensor error. Reach Komfort Air at 704-705-8135 for assistance.
  • 181/182—Get a new air filter. Clear the display by touching “dismiss” after adding a new filter.
  • 183—Rinse humidifier tank and add a new water filter. Clear the screen by hitting “dismiss” after completing these tasks.
  • 184—Replace humidifier pad. Clear the monitor by tapping “dismiss” after getting a new pad filter.
  • 185—Install a new dehumidifier filter. Clear the thermostat by tapping “dismiss” after putting in a new filter.
  • 186—Wash ventilator core. Clear the thermostat by hitting “dismiss” after finishing this task.
  • 187—Rinse or replace ventilator filter. Clear the display by touching “dismiss” after installing a new filter.
  • 188/189—Install a new UV bulb. Get in touch with Komfort Air at 704-705-8135 for help.
  • 210—Register online for outside temperature. Use the Lyric app to finish this step and ensure correct thermostat operation.
  • 388—Register online for remote access and outside temperature. Use the Lyric app to do this step and ensure accurate thermostat operation.
  • 399—No Internet. Check your network settings.
  • 400—No Wi-Fi signal. Wait for the thermostat to reconnect or choose new Wi-Fi network.
  • 508—Wi-Fi not set up. Use the Lyric app and follow the steps to connect your thermostat.

For more details, see this thermostat’s user manual.

Our Experts are Ready to Provide Assistance

If you’re still experiencing problems after trying the troubleshooting list, our professionals are here to help. Reach us at 704-705-8135 and we’ll arrive rapidly to figure out the malfunction.

If you use an older thermostat, today is a fantastic time to think about a new thermostat. Thermostat technology has gotten better in recent years Ask us for more details on how smart thermostats can make your home more convenient while helping save on utility expenses year-round.

Contact Us