How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the leading thermostat manufacturers, and we proudly install them on a frequent basis in Windsor. They’re long-lasting and reliable. Also, Honeywell is frequently advancing its technology, resulting in more features for your home.

However, every thermostat can experience issues from time to time. As a result, we’ve compiled this useful guide to go over troubleshooting. While Honeywell thermostat troubleshooting problems are rare, they happen.

While you can often solve many thermostat problems alone, they occasionally call for Expert assistance. Our heating and cooling Experts are available to support you when you need us. We’re just a call away at 226-773-3357.

Let’s get started with the process by figuring out what type of thermostat your home has.

What Type of Thermostat Do I Have?

There are three kinds of thermostats:

Manual—This is the older dial-shaped thermostat. You won’t have error codes with this one, but it’s also the least efficient for reducing utility expenses.
Programmable—This thermostat features a digital screen and arrows you use to determine your desired temperature. You can also set daily programs to decrease the temperature when you’re away and increase it when you get back.
Smart—You won’t have to schedule any programs on this thermostat, because it learns your day. It instinctively changes the temperature when you or other household members are out and about to help you save on heating and cooling bills. 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 several malfunctions that might happen. The majority of of these problems don’t require pro assistance and are simple to repair on your own.

Common Honeywell Thermostat Troubleshooting Issues

Each Honeywell thermostat has an exclusive kind of codes assigned to the troubles that happen.

Think how simple it can be to fix a computer by restarting it. Many times, diagnosing a thermostat can be just as easy.

Here is a guide to the most common Honeywell thermostat problems. These apply to the following programmable thermostats:

Display is Blank

If the display is clear on your programmable thermostat, you may need to get new batteries. If that doesn’t fix the problem or you rely on a smart thermostat, there could be a wiring malfunction.

Next, you should ensure the power is enabled for your furnace or air handler. Verify the switch close to the indoor system is switched “on”.

Additionally, you should confirm all furnace cabinet or air handler doors/panels are securely secured.

A loose panel may activate the safety switch, which stops power to the unit.

While it’s less common, an empty display might indicate you will need to replace your thermostat.

HVAC System Won’t Turn On

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

When it’s hot, make sure you schedule the thermostat beneath the room temperature. In the winter, confirm it’s higher. This sounds silly, but we’ve seen it occur lots of times.

Ensure the power switch by your indoor system is in the “on” position. You should also check the cabinet doors or panels are tight on your furnace cabinet or air handler. An unsecured panel can activate the safety switch, diverting electricity to the equipment.

Heating or cooling still won’t run? Make sure circuit breakers haven’t flipped and that your HVAC equipment isn’t experiencing error codes.

“Cool On” or “Heat On” is Flickering

To begin, check your thermostat is set to “cool” or “heat.”

Then, verify it’s signaling the right system to start. This is usually 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 status. This feature keeps your unit from bad short cycling. This may take place if your power is interrupted.

Honeywell Thermostat-Specific Error Codes

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

164—Heat pump requires service. Call Bryant Heating & Cooling Service Experts at 226-773-3357 for assistance.
168—Wi-Fi radio error. Reach Lyric technical support at 800-633-3991. 170—Internal memory error. Call 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. Reach Lyric technical support at 800-633-3991.
175—AC power restarted. No action needed.
181/182—Replace air filter. Clear the screen by tapping “dismiss” after adding a new filter.
184—Put in a new humidifier pad. Clear the monitor by touching “dismiss” after installing a clean pad filter.
185—Replace dehumidifier filter. Clear the thermostat by touching “dismiss” after installing a clean filter.
187—Clean or replace ventilator filter. Clear the thermostat by hitting “dismiss” after installing a fresh filter.
188/189—Replace UV bulb. Contact Bryant Heating & Cooling Service Experts at 226-773-3357 for support.
210—Register online for outside temperature. Download the Lyric app to complete this step and ensure proper thermostat operation.
388—Register online for remote access and outside temperature. Download the Lyric app to finish 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 set up. Use the Lyric app and follow the process to configure your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005)

164—Heat pump must be serviced service. Contact Bryant Heating & Cooling Service Experts at 226-773-3357 for help.
168—Wi-Fi radio error. Contact Bryant Heating & Cooling Service Experts at 226-773-3357 for help.
170—Internal memory error. Reach Bryant Heating & Cooling Service Experts at 226-773-3357 for support.
171—Set date and time. Finish these settings so scheduling can operate.
173—Thermostat temperature sensor error. Contact Bryant Heating & Cooling Service Experts at 226-773-3357 for help.
175—AC power restored. No action required.
177—Indoor temperature sensor error. Reach Bryant Heating & Cooling Service Experts at 226-773-3357 for assistance.
178—Outdoor temperature sensor error. Contact Bryant Heating & Cooling Service Experts at 226-773-3357 for support.
181/182—Replace air filter. Clear the display by hitting “dismiss” after putting in a fresh filter.
183—Clean humidifier tank and install a new water filter. Clear the screen by hitting “dismiss” after finishing these procedures.
184—Replace humidifier pad. Clear the monitor by tapping “dismiss” after getting a new pad filter.
185—Replace dehumidifier filter. Clear the thermostat by hitting “dismiss” after installing a new filter.
186—Clean ventilator core. Clear the monitor by touching “dismiss” after completing this task.
187—Rinse or get a new ventilator filter. Clear the monitor by touching “dismiss” after buying a new filter.
188/189—Add a new UV bulb. Reach Bryant Heating & Cooling Service Experts at 226-773-3357 for assistance.
210—Register online for outdoor temperature. Download the Lyric app to do this step and ensure correct thermostat operation.
388—Register online for remote access and outdoor temperature. Download the Lyric app to do 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 pick new Wi-Fi network.
508—Wi-Fi not connected. Use the Lyric app and follow the process to connect your thermostat.

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

Our Experts are Here to Provide Assistance

If you’re still experiencing issues after trying the troubleshooting steps, our professionals are ready to support you. Reach us at 226-773-3357 and we’ll be out rapidly to figure out the malfunction.

If you have a dated thermostat, right now is a great time to think over a new thermostat. Thermostat technology has advanced over the last few years. Ask us for more details on how smart thermostats can make your house comfier while helping save on utility expenses year-round.

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