How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the top thermostat producers, and we proudly install them on a regular basis in Edmonton. They’re long-lasting and trustworthy. Plus, Honeywell is regularly improving its technology, resulting in more features for your residence.

However, each thermostat can experience errors now and then. Due to this, we’ve put together this informative manual to run through troubleshooting. While Honeywell thermostat troubleshooting problems are rare, they do pop up.

While you can usually solve the majority of thermostat issues by yourself, they often need Expert help. Our home comfort professionals are available to help when you need us. We’re only a call away at 780-800-7092.

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

What Model of Thermostat Do I Have?

There are three types of thermostats:

Manual—This is the older dial-shaped thermostat. You won’t experience error codes with this type, but it’s also the least efficient for reducing utility bills.
Programmable—This thermostat features 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 away and raise it when you come home.
Smart—You won’t have to set any programs on this thermostat, because it learns your schedule. It automatically raises and lowers the temperature when you or loved ones are out and about to help you save on heating and cooling expenses. You can also raise or lower the temperature anywhere on your phone or other Wi-Fi-enabled device.

As you know the majority of technologically advanced solutions, there are several problems that may happen. The majority of of these situations don’t need Expert support and are simple to fix on your own.

Common Honeywell Thermostat Troubleshooting Errors

Every Honeywell thermostat has a unique set of codes assigned to the troubles that happen.

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

Here are some of the most common Honeywell thermostat issues. These involve the following programmable thermostats:

Display is Blank

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

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

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

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

Less frequently, a blank screen might indicate you should buy a new thermostat.

Heating and Cooling System Won’t Turn On

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

During warm weather, verify you set the thermostat lower than the room temperature. When it’s cool, make sure it’s higher. This sounds absurd, but we’ve seen it take place many times.

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

Heating or cooling still won’t turn on? 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 start, confirm your thermostat is switched to “cool” or “heat.”

Then, make sure it’s signaling the correct equipment to turn on. This is often shown by “cool on,” “heat on” or a picture.

If this phrase or the illustration is pulsing, your thermostat is in a five-minute delay mode. This mode stops your equipment from harmful 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 needs service. Call McKinley Heating Service Experts at 780-800-7092 for help.
168—Wi-Fi radio error. Reach Lyric technical support at 800-633-3991. 170—Internal memory error. Contact Lyric technical support at 800-633-3991.
171—Set date and time. Finish these settings so scheduling can occur.
173—Thermostat temperature sensor error. Contact Lyric technical support at 800-633-3991.
175—AC power restarted. No action necessary.
181/182—Replace air filter. Clear the display by touching “dismiss” after installing a fresh filter.
184—Replace humidifier pad. Clear the screen by touching “dismiss” after installing a new pad filter.
185—Put in a new dehumidifier filter. Clear the screen by touching “dismiss” after putting in a new filter.
187—Clean or install a new ventilator filter. Clear the thermostat by touching “dismiss” after putting in a clean filter.
188/189—Replace UV bulb. Ring McKinley Heating Service Experts at 780-800-7092 for support.
210—Register online for outside temperature. Use the Lyric app to do this step and ensure proper thermostat operation.
388—Register online for remote access and outdoor temperature. Get the Lyric app to finish this step and ensure proper thermostat operation.
399—No Internet. Confirm 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 procedure to connect your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005)

164—Heat pump must be serviced service. Call McKinley Heating Service Experts at 780-800-7092 for help.
168—Wi-Fi radio error. Contact McKinley Heating Service Experts at 780-800-7092 for support.
170—Internal memory error. Call McKinley Heating Service Experts at 780-800-7092 for support.
171—Set date and time. Finish these settings so scheduling can work.
173—Thermostat temperature sensor error. Call McKinley Heating Service Experts at 780-800-7092 for help.
175—AC power restored. No action required.
177—Indoor temperature sensor error. Contact McKinley Heating Service Experts at 780-800-7092 for support.
178—Outdoor temperature sensor error. Call McKinley Heating Service Experts at 780-800-7092 for assistance.
181/182—Install a new air filter. Clear the screen by hitting “dismiss” after adding a clean filter.
183—Clean humidifier tank and add a new water filter. Clear the thermostat by hitting “dismiss” after completing these procedures.
184—Replace humidifier pad. Clear the monitor by touching “dismiss” after installing pad filter.
185—Get a new dehumidifier filter. Clear the thermostat by touching “dismiss” after installing a fresh filter.
186—Rinse ventilator core. Clear the screen by hitting “dismiss” after completing this task.
187—Wash or install a new ventilator filter. Clear the screen by tapping “dismiss” after installing a new filter.
188/189—Replace UV bulb. Get in touch with McKinley Heating Service Experts at 780-800-7092 for help.
210—Register online for outside temperature. Get the Lyric app to complete this step and ensure accurate thermostat operation.
388—Register online for remote access and exterior temperature. Get the Lyric app to do this step and ensure correct thermostat operation.
399—No Internet. Verify your network settings.
400—No Wi-Fi signal. Wait for the thermostat to reconnect or select new Wi-Fi network.
508—Wi-Fi not configured. Use the Lyric app and follow the steps to connect your thermostat.

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

Our Experts are Here to Provide Assistance

If you’re still running into troubles after going through the troubleshooting list, our professionals are available to assist you. Call us at 780-800-7092 and we’ll be out rapidly to figure out the problem.

If you have an aging thermostat, today is a fantastic time to think about a replacement. Thermostat technology has advanced over the last few years. Ask us for more info on how smart thermostats can make your house more comfortable while helping save on utility bills year-round.

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