How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the best thermostat manufacturers, and we proudly install them on a usual basis in the U.S.. They’re durable and dependable. In addition, Honeywell is constantly advancing its technology, offering more features for your household.

Still, every thermostat can experience troubles once in awhile. That’s why we’ve compiled this valuable guidebook to walk you through troubleshooting. While Honeywell thermostat troubleshooting problems are rare, they happen.

While you can usually solve most thermostat troubles by yourself, they often call for Expert assistance. Our heating and cooling professionals are available to assist you when you need us. We’re only a call away at 866-397-3787.

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

What Kind of Thermostat Do I Have?

There are three models of thermostats:

    • Manual—This is the older dial-shaped thermostat. You won’t experience error codes with this one, but it’s also the least efficient for saving on heating and cooling bills.
    • Programmable—This thermostat has a digital screen and arrows you touch to set your desired temperature. You can also choose daily programs to reduce the temperature when you’re away and raise it when you return.
    • Smart—You won’t have to set any programs on this thermostat, since it learns your schedule. It intuitively raises and lowers the temperature when you or other household members are away to help you save on heating and cooling bills. You can also raise or lower the temperature anywhere on your phone or other Wi-Fi-enabled device.

As you’re aware many technologically advanced things, there are several malfunctions that can occur. The majority of of these troubles don’t call for Expert assistance and are uncomplicated enough to solve on your own.

Common Honeywell Thermostat Troubleshooting Problems

All Honeywell thermostats have a special group of codes assigned to the troubles that occur.

Think how easy it can be to repair a computer by restarting it. In most situations, troubleshooting a thermostat can be just as simple.

Here is a listing the most common Honeywell thermostat problems. These are applicable to the following programmable thermostats:

Display is Blank

If the display is blank on your programmable thermostat, you could need to replace the batteries. If that doesn’t fix the trouble or you rely on a smart thermostat, there might be a wiring issue.

Next, you should make sure the power is enabled for your furnace or air handler. Make sure the switch near the indoor system is switched “up”.

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

An unsecured panel may activate the safety switch, which disconnects power to the unit.

Less frequently, a blank display may signify you need to install a new thermostat.

Comfort Equipment Won’t Work

Make sure that your thermostat is switched to “cool” or “heat,” not “off.”

When it’s hot, make sure you put the thermostat below the ambient temperature. In the winter, confirm it’s higher. This sounds silly, but we’ve seen it take place lots of times.

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

Heating or cooling still won’t turn on? Verify circuit breakers haven’t turned off and that your HVAC system isn’t displaying error codes.

“Cool On” or “Heat On” is Flashing

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

Then, ensure it’s calling for the appropriate equipment to turn on. This is typically shown by “cool on,” “heat on” or an icon.

If this set of words or the icon is pulsing, your thermostat is in a five-minute delay mode. This setting keeps your equipment from harmful short cycling. This could take place if you lose electricity.

Honeywell Thermostat-Specific Error Codes

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

    • 164—Heat pump needs service. Call Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for assistance.
    • 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. Finalize these settings so scheduling can take place.
    • 173—Thermostat temperature sensor error. Contact Lyric technical support at 800-633-3991.
    • 175—AC power restarted. No action needed.
    • 181/182—Install a new air filter. Clear the thermostat by touching “dismiss” after putting in a clean filter.
    • 184—Put in a new humidifier pad. Clear the display by hitting “dismiss” after installing a fresh pad filter.
    • 185—Replace dehumidifier filter. Clear the thermostat by hitting “dismiss” after putting in a clean filter.
    • 187—Clean or install a new ventilator filter. Clear the display by tapping “dismiss” after putting in a clean filter.
    • 188/189—Get a new UV bulb. Call Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for help.
    • 210—Register online for outdoor temperature. Get the Lyric app to finish this step and ensure proper thermostat operation.
    • 388—Register online for remote access and exterior temperature. Download the Lyric app to do this step and ensure correct thermostat operation.
    • 399—No Internet. Check 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. Use the Lyric app and follow the procedure to link your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005)

    • 164—Heat pump needs service. Contact Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for assistance.
    • 168—Wi-Fi radio error. Call Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for support.
    • 170—Internal memory error. Reach Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for assistance.
    • 171—Set date and time. Finalize these settings so scheduling can run.
    • 173—Thermostat temperature sensor error. Reach Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for help.
    • 175—AC power resumed. No action necessary.
    • 177—Indoor temperature sensor error. Contact Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for help.
    • 178—Outdoor temperature sensor error. Call Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for assistance.
    • 181/182—Get a new air filter. Clear the display by hitting “dismiss” after installing a fresh filter.
    • 183—Wash humidifier tank and install a new water filter. Clear the monitor by touching “dismiss” after doing these tasks.
    • 184—Install a new humidifier pad. Clear the thermostat by tapping “dismiss” after installing pad filter.
    • 185—Install a new dehumidifier filter. Clear the display by hitting “dismiss” after putting in a clean filter.
    • 186—Clean ventilator core. Clear the display by tapping “dismiss” after completing this task.
    • 187—Clean or get a new ventilator filter. Clear the display by hitting “dismiss” after buying a new filter.
    • 188/189—Install a new UV bulb. Contact Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 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 outdoor temperature. Download the Lyric app to complete this step and ensure proper thermostat operation.
    • 399—No Internet. Check 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. Get the Lyric app and follow the process to connect your thermostat.

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

Our Experts are Here to Help

If you’re still experiencing issues after going through the troubleshooting process, our professionals are here to assist you. Give us a call at 866-397-3787 and we’ll arrive rapidly to determine the issue.

If you rely on a dated thermostat, today is a great time to think over a new thermostat. Thermostat technology has advanced in recent years Ask us for more information on how smart thermostats can make your house more comfortable while helping save on energy costs year-round.

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