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 regularly enhancing its technology, resulting in more features for your residence.

Nevertheless, every thermostat can have errors now and again. Due to this, we’ve compiled this informative guidebook to go over troubleshooting.

While you can often solve most thermostat problems alone, they occasionally call for Expert help. Our heating and cooling professionals are here to support you when you need us. We’re just a call away at 217-689-2469.

Let’s start the process by figuring out what model 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 touch to set your desired temperature. You can also set daily programs to lower the temperature when you’re gone and raise it when you return.
  • Smart—You won’t have to make any programs on this thermostat, because it learns your schedule. It instinctively adjusts the temperature when you or family members are out and about to help you save on utility expenses. You can also raise or lower the temperature anywhere on your phone or other Wi-Fi-enabled device. 

As is the case with many technologically advanced things, there are several malfunctions that might occur. The majority of of these situations don’t call for pro assistance and are uncomplicated enough to solve on your own.

Common Honeywell Thermostat Problems

Each thermostat has a unique group of codes matching the malfunctions that happen.

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 encountered Honeywell thermostat issues. These apply to the following programmable thermostats:

Display is Blank

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

Next, you should ensure the power is enabled for your furnace or air handler. Verify the switch by the indoor system is in the “on” position.

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

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

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

Comfort Unit Won’t Run

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

When it’s hot, confirm you set the thermostat beneath the room temperature. When it’s cold, confirm it’s higher. This sounds absurd, but we’ve seen it take place lots of times.

Ensure the power switch by your indoor system is in the “on” position. You should also comfirm the cabinet doors or panels are secure on your furnace cabinet or air handler. A loose panel can trigger the safety switch, stopping electricity 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 signaling the appropriate unit to start. This is typically indicated by “cool on,” “heat on” or an illustration.

If this set of words or the picture is blinking, your thermostat is in a five-minute delay status. This feature keeps your unit from bad short cycling. This could occur if you lose electricity.

Honeywell Thermostat-Specific Error Codes

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

  • 164—Heat pump needs service. Call Chief/Bauer Service Experts at 217-689-2469 for help.
  • 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. Finalize these settings so scheduling can occur.
  • 173—Thermostat temperature sensor error. Call Lyric technical support at 800-633-3991.
  • 175—AC power restored. No action required.
  • 181/182—Replace air filter. Clear the thermostat by tapping “dismiss” after installing a new filter.
  • 184—Put in a new humidifier pad. Clear the screen by hitting “dismiss” after adding a clean pad filter.
  • 185—Put in a new dehumidifier filter. Clear the display by touching “dismiss” after adding a fresh filter.
  • 187—Clean or put in a new ventilator filter. Clear the thermostat by hitting “dismiss” after adding a fresh filter.
  • 188/189—Install a new UV bulb. Call Chief/Bauer Service Experts at 217-689-2469 for assistance.
  • 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 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 pick new Wi-Fi network.
  • 508—Wi-Fi not configured. Get the Lyric app and follow the procedure 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 help.
  • 168—Wi-Fi radio error. Call Chief/Bauer Service Experts at 217-689-2469 for assistance.
  • 170—Internal memory error. Reach Chief/Bauer Service Experts at 217-689-2469 for support.
  • 171—Set date and time. Finalize 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 reconnected. No action needed.
  • 177—Indoor temperature sensor error. Reach Chief/Bauer Service Experts at 217-689-2469 for assistance.
  • 178—Outdoor temperature sensor error. Contact Chief/Bauer Service Experts at 217-689-2469 for support.
  • 181/182—Install a new air filter. Clear the monitor by hitting “dismiss” after putting in a clean filter.
  • 183—Wash humidifier tank and install a new water filter. Clear the screen by tapping “dismiss” after completing these tasks.
  • 184—Replace humidifier pad. Clear the display by tapping “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—Wash or get a new ventilator filter. Clear the screen by hitting “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 support.
  • 210—Register online for outdoor temperature. Get 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 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 set up. Get the Lyric app and follow the process to connect your thermostat.

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

Our Experts are Ready to Provide Support

If you’re still experiencing problems after going through the troubleshooting list, our Experts are available to assist you. Call us at 217-689-2469 and we’ll come to your house rapidly to figure out the problem.

If you have a dated thermostat, today is a fantastic time to consider a replacement. Thermostat technology has gotten better in recent years Ask us for more information on how smart thermostats can make your residence more comfortable while helping save on energy bills all year.

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