How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the best thermostat producers, and we proudly install them on a frequent basis in Champaign. They’re durable and trustworthy. Also, Honeywell is frequently enhancing its technology, resulting in more features for your residence.

Nevertheless, every thermostat can have errors every so often. Due to this, we’ve put together this helpful guidebook to run through troubleshooting. While Honeywell thermostat problems are rare, they do pop up. 

While you can often repair most thermostat problems by yourself, they occasionally need Expert help. Our heating and cooling professionals are here to assist you when you need us. We’re merely a call away at 217-689-2469.

Let’s start the process by figuring out what kind of thermostat your home has.

What Kind of Thermostat Do I Have?

There are three types of thermostats:

  • Manual—This is the classic dial-shaped thermostat. You won’t have error codes with this type, but it’s also the least efficient for saving on energy costs.
  • Programmable—This thermostat has a digital screen and arrows you use to set your desired temperature. You can also set daily programs to decrease the temperature when you’re away and raise it when you get back.
  • Smart—You won’t have to schedule any programs on this thermostat, because it learns your schedule. It instinctively adjusts the temperature when you or loved ones are gone to help you save on utility expenses. You can also raise or lower the temperature anywhere using your phone or other Wi-Fi-enabled device. 

As is the case with many technologically advanced things, there are regular glitches that may occur. Most of these situations don’t need pro assistance and are simple to repair on your own.

Common Honeywell Thermostat Problems

Each thermostat has a unique kind of codes that correspond to the malfunctions that take place.

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

Here are some of the most reported Honeywell thermostat problems. These include the following programmable thermostats:

Display is Blank

If the display is empty on your programmable thermostat, you could need to replace the batteries. If that doesn’t take care of the problem or you have a smart thermostat, there may be a wiring problem.

Next, you should check the power is flowing for your furnace or air handler. Verify the switch close to the indoor system is in the “on” position.

Also, you should make sure all furnace cabinet or air handler doors/panels are sturdily fastened.

An unsecured panel may trip the safety switch, which cuts off power to the equipment.

Infrequently, a blank monitor might indicate you need to install a new thermostat.

Comfort Equipment Won’t Run

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

When it’s hot, verify you set the thermostat below the ambient temperature. When it’s cool, confirm it’s higher. This sounds goofy, but we’ve seen it take place a lot of times.

Confirm the power switch by your indoor system is in the “on” position. You should also check the cabinet doors or panels are secure on your furnace cabinet or air handler. A loose panel can activate the safety switch, stopping current to the equipment.

Heating or cooling still won’t turn on? Confirm circuit breakers haven’t turned off and that your HVAC equipment isn’t experiencing error codes.

“Cool On” or “Heat On” is Flashing

First, check your thermostat is on “cool” or “heat.”

Then, ensure it’s telling the appropriate unit to start. This is often indicated by “cool on,” “heat on” or a picture.

If this phrase or the picture is pulsing, your thermostat is in a five-minute delay state. This feature keeps your unit from harmful short cycling. This may occur if you lose electricity.

Honeywell Thermostat-Specific Error Codes

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

  • 164—Heat pump requires service. Call Chief/Bauer Service Experts at 217-689-2469 for support.
  • 168—Wi-Fi radio error. Call Lyric technical support at 800-633-3991. 170—Internal memory error. Contact Lyric technical support at 800-633-3991.
  • 171—Set date and time. Finish these settings so scheduling can take place.
  • 173—Thermostat temperature sensor error. Call Lyric technical support at 800-633-3991.
  • 175—AC power restarted. No action required.
  • 181/182—Replace air filter. Clear the thermostat by tapping “dismiss” after installing a new filter.
  • 184—Install a new humidifier pad. Clear the screen by tapping “dismiss” after adding a clean pad filter.
  • 185—Install a new dehumidifier filter. Clear the display by touching “dismiss” after putting in a fresh filter.
  • 187—Clean or put in a new ventilator filter. Clear the thermostat by tapping “dismiss” after putting in a clean filter.
  • 188/189—Get a new UV bulb. Call Chief/Bauer Service Experts at 217-689-2469 for assistance.
  • 210—Register online for outside temperature. Get the Lyric app to finish this step and ensure accurate thermostat operation.
  • 388—Register online for remote access and exterior temperature. Use 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 choose new Wi-Fi network.
  • 508—Wi-Fi not configured. Use the Lyric app and follow the process to connect your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005) 

  • 164—Heat pump must be serviced service. Contact Chief/Bauer Service Experts at 217-689-2469 for support.
  • 168—Wi-Fi radio error. Call Chief/Bauer Service Experts at 217-689-2469 for assistance.
  • 170—Internal memory error. Contact Chief/Bauer Service Experts at 217-689-2469 for help.
  • 171—Set date and time. Finish these settings so scheduling can operate.
  • 173—Thermostat temperature sensor error. Reach Chief/Bauer Service Experts at 217-689-2469 for assistance.
  • 175—AC power restored. No action needed.
  • 177—Indoor temperature sensor error. Contact Chief/Bauer Service Experts at 217-689-2469 for assistance.
  • 178—Outdoor temperature sensor error. Reach Chief/Bauer Service Experts at 217-689-2469 for support.
  • 181/182—Install a new air filter. Clear the screen by hitting “dismiss” after putting in a clean filter.
  • 183—Rinse humidifier tank and add a new water filter. Clear the monitor by tapping “dismiss” after completing these tasks.
  • 184—Replace humidifier pad. Clear the screen by hitting “dismiss” after getting a new pad filter.
  • 185—Install a new dehumidifier filter. Clear the display by tapping “dismiss” after adding a new filter.
  • 186—Wash ventilator core. Clear the thermostat by touching “dismiss” after completing this task.
  • 187—Rinse or install a new ventilator filter. Clear the screen by tapping “dismiss” after installing a new filter.
  • 188/189—Add a new UV bulb. Get in touch with Chief/Bauer Service Experts at 217-689-2469 for help.
  • 210—Register online for outdoor temperature. Use the Lyric app to complete this step and ensure proper thermostat operation.
  • 388—Register online for remote access and outdoor temperature. Download the Lyric app to do 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 pick new Wi-Fi network.
  • 508—Wi-Fi not set up. Use the Lyric app and follow the procedures to connect your thermostat.

For more information, look at this thermostat’s user manual.

Our Experts are Available to Provide Assistance

If you’re still experiencing problems after trying the troubleshooting process, our Experts are available to support you. Call us at 217-689-2469 and we’ll come to your house as fast as we can to determine the problem.

If you have a dated thermostat, right now is a great time to consider a replacement. Thermostat technology has advanced lately Ask us for more information on how smart thermostats can make your residence more comfortable while helping save on utility bills throughout the year.

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