How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the top thermostat producers, and we proudly install them on a usual basis in Daytona Beach. They’re sturdy and dependable. In addition, Honeywell is regularly advancing its technology, bringing more features for your home.

Nevertheless, all thermostats can experience troubles now and again. As a result, we’ve put together this helpful guide to walk you through troubleshooting.

While you can often repair many thermostat troubles alone, they sometimes call for Expert help. Our heating and cooling pros are available to help when you need us. We’re only a call away at 386-310-2061.

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

What Type 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 one, but it’s also the least efficient for reducing energy bills.
  • Programmable—This thermostat features a digital screen and arrows you use to choose your desired temperature. You can also use daily programs to decrease the temperature when you’re at work and set it higher when you get back.
  • Smart—You won’t have to set any programs on this thermostat, since it learns your schedule. It intuitively changes the temperature when you or loved ones are away to help you save on utility costs. You can also change the temperature anywhere via your phone or other Wi-Fi-enabled device. 

As you’re aware most technologically advanced things, there are common glitches that may occur. The majority of of these troubles don’t require professional assistance and are uncomplicated enough to repair by yourself.

Common Honeywell Thermostat Problems

Every thermostat has an exclusive group of codes matching the issues that occur.

Think how easy it can be to restore a computer by restarting it. In most situations, diagnosing a thermostat can be just as easy.

Here is a listing the most encountered Honeywell thermostat issues. These include the following programmable thermostats:

Display is Blank

If the screen is clear on your programmable thermostat, you might need to put in new batteries. If that doesn’t solve the issue or you use a smart thermostat, there might be a wiring issue.

Next, you should make sure the power is on for your furnace or air handler. Verify the switch close to the indoor equipment is switched “up”.

Additionally, you should make sure all furnace cabinet or air handler doors/panels are sturdily in place.

A loose panel may activate the safety switch, which disconnects power to the system.

Infrequently, an empty screen could mean you will need to buy a new thermostat.

HVAC Unit Won’t Work

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

When it’s hot, confirm you schedule the thermostat lower than the current temperature. When it’s cold, verify it’s higher. This sounds goofy, but we’ve seen it occur a lot of times.

Confirm the power switch close to your indoor unit 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 power to the system.

System still won’t start? Confirm circuit breakers haven’t tripped and that your HVAC unit isn’t showing error codes.

“Cool On” or “Heat On” is Flickering

To start, make sure your thermostat is on “cool” or “heat.”

Then, verify it’s signaling the correct system to run. This is usually demonstrated by “cool on,” “heat on” or an illustration.

If this phrase or the illustration is blinking, your thermostat is in a five-minute delay status. This feature keeps your unit from harmful short cycling. This could happen if your power is interrupted.

Honeywell Thermostat-Specific Error Codes

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

  • 164—Heat pump must be serviced. Call All American Air Service Experts at 386-310-2061 for assistance.
  • 168—Wi-Fi radio error. Reach 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 occur.
  • 173—Thermostat temperature sensor error. Call Lyric technical support at 800-633-3991.
  • 175—AC power resumed. No action needed.
  • 181/182—Replace air filter. Clear the display by touching “dismiss” after installing a fresh filter.
  • 184—Install a new humidifier pad. Clear the monitor by hitting “dismiss” after installing a new pad filter.
  • 185—Replace dehumidifier filter. Clear the screen by tapping “dismiss” after installing a clean filter.
  • 187—Rinse or install a new ventilator filter. Clear the screen by tapping “dismiss” after putting in a fresh filter.
  • 188/189—Install a new UV bulb. Contact All American Air Service Experts at 386-310-2061 for help.
  • 210—Register online for exterior temperature. Download the Lyric app to do this step and ensure accurate thermostat operation.
  • 388—Register online for remote access and outdoor temperature. Get the Lyric app to complete this step and ensure correct thermostat operation.
  • 399—No Internet. Confirm 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. Use the Lyric app and follow the process to configure your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005) 

  • 164—Heat pump requires service. Contact All American Air Service Experts at 386-310-2061 for assistance.
  • 168—Wi-Fi radio error. Call All American Air Service Experts at 386-310-2061 for support.
  • 170—Internal memory error. Contact All American Air Service Experts at 386-310-2061 for assistance.
  • 171—Set date and time. Complete these settings so scheduling can work.
  • 173—Thermostat temperature sensor error. Reach All American Air Service Experts at 386-310-2061 for help.
  • 175—AC power restored. No action necessary.
  • 177—Indoor temperature sensor error. Contact All American Air Service Experts at 386-310-2061 for assistance.
  • 178—Outdoor temperature sensor error. Call All American Air Service Experts at 386-310-2061 for support.
  • 181/182—Get a new air filter. Clear the thermostat by touching “dismiss” after putting in a new filter.
  • 183—Clean humidifier tank and install a new water filter. Clear the monitor by hitting “dismiss” after doing these steps.
  • 184—Get a new humidifier pad. Clear the monitor by hitting “dismiss” after adding a new pad filter.
  • 185—Replace dehumidifier filter. Clear the thermostat by hitting “dismiss” after adding a new filter.
  • 186—Wash ventilator core. Clear the screen by touching “dismiss” after completing this task.
  • 187—Wash or install a new ventilator filter. Clear the monitor by hitting “dismiss” after buying a new filter.
  • 188/189—Add a new UV bulb. Get in touch with All American Air Service Experts at 386-310-2061 for assistance.
  • 210—Register online for exterior 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 connected. Download the Lyric app and follow the process to connect your thermostat.

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

Our Experts are Ready to Provide Assistance

If you’re still running into problems after working through the troubleshooting steps, our pros are here to support you. Give us a call at 386-310-2061 and we’ll be out as fast as we can to figure out the issue.

If you have an older thermostat, today is a fantastic time to consider a new device. Thermostat technology has come a long way over the last few years. Ask us for more information on how smart thermostats can make your home better while helping save on utility expenses throughout the year.

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