How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the best thermostat producers, and we proudly install them on a regular basis in Fort Lauderdale. They’re long-lasting and trustworthy. Plus, Honeywell is regularly improving its technology, bringing more features for your house.

Nevertheless, each thermostat can run into troubles at one time or another. That’s why we’ve put together this valuable manual to run through troubleshooting. While Honeywell thermostat troubleshooting problems are rare, they do pop up.

While you can typically repair the majority of thermostat issues on your own, they sometimes call for Expert support. Our heating and cooling professionals are ready to support you when you need us. We’re only a call away at 954-736-4314.

Let’s get started with the process by finding out what type of thermostat your residence 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 run into error codes with this type, but it’s also the least efficient for saving on energy costs.
Programmable—This thermostat includes a digital screen and arrows you press to determine your desired temperature. You can also choose daily programs to decrease the temperature when you’re gone and set it higher when you get back.
Smart—You won’t have to make any programs on this thermostat, since it picks up on your day. It intuitively raises and lowers the temperature when you or loved ones are out and about to help you save on energy expenses. You can also raise or lower the temperature anywhere using your phone or other Wi-Fi-enabled device.

As you know most technologically advanced products, there are common glitches that may take place. Most of these troubles don’t require Expert assistance and are uncomplicated enough to fix by yourself.

Common Honeywell Thermostat Troubleshooting Problems

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

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

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

Display is Blank

If the monitor is empty on your programmable thermostat, you may need to put in new batteries. If that doesn’t take care of the trouble or you have 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 unit is in the “on” position.

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

An unsecured panel may trip the safety switch, which cuts off power to the equipment.

While it’s less common, an empty screen might mean you will need to buy a new thermostat.

HVAC System Won’t Start

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

In the summer, confirm you put the thermostat beneath the current temperature. When it’s cold, verify it’s higher. This sounds goofy, but we’ve seen it take place a lot of times.

Ensure the power switch close to your indoor unit 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 trigger the safety switch, diverting power to the equipment.

Unit still won’t run? Confirm circuit breakers haven’t flipped and that your HVAC equipment isn’t experiencing error codes.

“Cool On” or “Heat On” is Blinking

First, verify your thermostat is set to “cool” or “heat.”

Then, ensure it’s telling the right unit to turn on. This is typically demonstrated by “cool on,” “heat on” or a picture.

If this set of words or the illustration is pulsing, your thermostat is in a five-minute delay state. This feature keeps your equipment from bad short cycling. This may take place if you lose power.

Honeywell Thermostat-Specific Error Codes

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

164—Heat pump must be serviced. Call Service Experts Heating & Air Conditioning at 954-736-4314 for help.
168—Wi-Fi radio error. Contact Lyric technical support at 800-633-3991. 170—Internal memory error. Reach 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. Contact Lyric technical support at 800-633-3991.
175—AC power resumed. No action required.
181/182—Put in a new air filter. Clear the monitor by touching “dismiss” after putting in a fresh filter.
184—Install a new humidifier pad. Clear the monitor by hitting “dismiss” after putting in a new pad filter.
185—Install a new dehumidifier filter. Clear the monitor by hitting “dismiss” after installing a clean filter.
187—Wash or install a new ventilator filter. Clear the monitor by tapping “dismiss” after installing a fresh filter.
188/189—Install a new UV bulb. Contact Service Experts Heating & Air Conditioning at 954-736-4314 for assistance.
210—Register online for exterior temperature. Get the Lyric app to complete 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 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. Get the Lyric app and follow the process to link your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005)

164—Heat pump needs service. Call Service Experts Heating & Air Conditioning at 954-736-4314 for support.
168—Wi-Fi radio error. Contact Service Experts Heating & Air Conditioning at 954-736-4314 for assistance.
170—Internal memory error. Call Service Experts Heating & Air Conditioning at 954-736-4314 for help.
171—Set date and time. Complete these settings so scheduling can operate.
173—Thermostat temperature sensor error. Call Service Experts Heating & Air Conditioning at 954-736-4314 for support.
175—AC power resumed. No action needed.
177—Indoor temperature sensor error. Reach Service Experts Heating & Air Conditioning at 954-736-4314 for help.
178—Outdoor temperature sensor error. Call Service Experts Heating & Air Conditioning at 954-736-4314 for support.
181/182—Install a new air filter. Clear the thermostat by hitting “dismiss” after installing a clean filter.
183—Clean humidifier tank and add a new water filter. Clear the screen by tapping “dismiss” after doing these steps.
184—Install a new humidifier pad. Clear the screen by hitting “dismiss” after installing pad filter.
185—Replace dehumidifier filter. Clear the monitor by tapping “dismiss” after putting in a clean filter.
186—Rinse ventilator core. Clear the monitor by tapping “dismiss” after doing this task.
187—Rinse or get a new ventilator filter. Clear the display by hitting “dismiss” after installing a new filter.
188/189—Install a new UV bulb. Reach Service Experts Heating & Air Conditioning at 954-736-4314 for support.
210—Register online for outside temperature. Use the Lyric app to complete this step and ensure accurate thermostat operation.
388—Register online for remote access and outdoor temperature. Download the Lyric app to finish this step and ensure accurate 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. Download the Lyric app and follow the procedures to connect your thermostat.

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

Our Experts are Ready to Provide Assistance

If you’re still running into problems after going through the troubleshooting process, our Experts are available to help. Reach us at 954-736-4314 and we’ll arrive as fast as we can to figure out the problem.

If you use an aging thermostat, right now is a great time to think about a new device. Thermostat technology has gotten better in recent years Ask us for more details on how smart thermostats can make your residence better while helping save on utility bills throughout the year.