How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the top thermostat producers, and we proudly install them on a usual basis in Edmonton. They’re long-lasting and dependable. In addition, Honeywell is constantly improving its technology, offering more features for your household.

Nevertheless, all thermostats can run into errors from time to time. Due to this, we’ve compiled this valuable guidebook to walk you through troubleshooting. While Honeywell thermostat troubleshooting problems are rare, they do pop up.

While you can usually repair many thermostat problems alone, they sometimes require Expert assistance. Our heating and cooling pros are here to assist you when you need us. We’re merely a call away at 780-800-9047.

Let’s get started with the process by determining what model of thermostat your home has.

What Type of Thermostat Do I Have?

There are three kinds of thermostats:

Manual—This is the typical dial-shaped thermostat. You won’t experience error codes with this type, but it’s also the least efficient for saving on heating and cooling expenses.
Programmable—This thermostat includes a digital screen and arrows you press to determine your desired temperature. You can also use daily programs to decrease the temperature when you’re at work and increase it when you get back.
Smart—You won’t have to set any programs on this thermostat, because it learns your day. It instinctively changes the temperature when you or family members are away to help you save on utility costs. You can also change the temperature anywhere on your phone or other Wi-Fi-enabled device.

As you know many technologically advanced solutions, there are regular problems that may occur. Many of these problems don’t call for professional assistance and are simple to solve by yourself.

Common Honeywell Thermostat Troubleshooting Issues

Each Honeywell thermostat has a unique kind of codes matching the troubles that occur.

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

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

Display is Blank

If the monitor is blank on your programmable thermostat, you might need to replace the batteries. If that doesn’t take care of the trouble or you use a smart thermostat, there may be a wiring issue.

Next, you should check the power is flowing for your furnace or air handler. Verify the switch by the indoor equipment is switched “up”.

In addition to that, you should make certain all furnace cabinet or air handler doors/panels are securely secured.

A panel that isn’t tight may activate the safety switch, which stops power to the unit.

Infrequently, a clear monitor can mean you will need to buy a new thermostat.

Heating and Cooling Unit Won’t Run

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

During warm weather, make sure you put the thermostat beneath the ambient temperature. When it’s cool, confirm it’s higher. This sounds silly, but we’ve seen it occur a lot of times.

Make sure the power switch near your indoor system is in the “on” position. You should also make sure the cabinet doors or panels are tight on your furnace cabinet or air handler. A loose panel can activate the safety switch, cutting off current to the system.

Equipment still won’t turn on? Confirm circuit breakers haven’t tripped and that your HVAC unit isn’t experiencing error codes.

“Cool On” or “Heat On” is Blinking

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

Then, make sure it’s signaling the correct unit to start. This is often demonstrated by “cool on,” “heat on” or an illustration.

If this set of words or the picture is pulsing, your thermostat is in a five-minute delay status. This feature keeps your unit from bad 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 needs service. Call Rob's Albertan Service Experts at 780-800-9047 for assistance.
168—Wi-Fi radio error. Contact 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 run.
173—Thermostat temperature sensor error. Reach Lyric technical support at 800-633-3991.
175—AC power restored. No action necessary.
181/182—Replace air filter. Clear the monitor by touching “dismiss” after putting in a clean filter.
184—Put in a new humidifier pad. Clear the thermostat by touching “dismiss” after putting in a new pad filter.
185—Replace dehumidifier filter. Clear the thermostat by hitting “dismiss” after adding a new filter.
187—Wash or replace ventilator filter. Clear the display by tapping “dismiss” after putting in a new filter.
188/189—Install a new UV bulb. Call Rob's Albertan Service Experts at 780-800-9047 for support.
210—Register online for outdoor temperature. Use the Lyric app to do this step and ensure correct thermostat operation.
388—Register online for remote access and outside temperature. Get the Lyric app to finish 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 configured. Use the Lyric app and follow the procedure to link your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005)

164—Heat pump needs service. Call Rob's Albertan Service Experts at 780-800-9047 for support.
168—Wi-Fi radio error. Call Rob's Albertan Service Experts at 780-800-9047 for assistance.
170—Internal memory error. Reach Rob's Albertan Service Experts at 780-800-9047 for assistance.
171—Set date and time. Complete these settings so scheduling can operate.
173—Thermostat temperature sensor error. Contact Rob's Albertan Service Experts at 780-800-9047 for help.
175—AC power restored. No action needed.
177—Indoor temperature sensor error. Contact Rob's Albertan Service Experts at 780-800-9047 for help.
178—Outdoor temperature sensor error. Contact Rob's Albertan Service Experts at 780-800-9047 for support.
181/182—Get a new air filter. Clear the display by tapping “dismiss” after adding a clean filter.
183—Wash humidifier tank and replace water filter. Clear the monitor by tapping “dismiss” after completing these procedures.
184—Install a new humidifier pad. Clear the thermostat by touching “dismiss” after getting a new pad filter.
185—Get a new dehumidifier filter. Clear the display by hitting “dismiss” after adding a fresh filter.
186—Rinse ventilator core. Clear the thermostat by hitting “dismiss” after finishing this task.
187—Clean or get a new ventilator filter. Clear the display by touching “dismiss” after installing a new filter.
188/189—Add a new UV bulb. Contact Rob's Albertan Service Experts at 780-800-9047 for assistance.
210—Register online for exterior temperature. Download the Lyric app to finish this step and ensure proper thermostat operation.
388—Register online for remote access and outside temperature. Get the Lyric app to complete 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 connected. Use 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 issues after trying the troubleshooting process, our Experts are here to assist you. Reach us at 780-800-9047 and we’ll come to your house quickly to diagnose the issue.

If you have an older thermostat, today is a good time to consider a new thermostat. Thermostat technology has advanced over the last few years. Ask us for more information on how smart thermostats can make your house comfier while helping save on energy expenses year-round.

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