How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the top thermostat producers, and we proudly install them on a frequent basis in Fort Lauderdale. They’re sturdy and reliable. Plus, Honeywell is frequently improving its technology, bringing more features for your residence.

Still, every thermostat can have troubles at times. Due to this, we’ve prepared this helpful manual to walk you through troubleshooting. While Honeywell thermostat troubleshooting problems are rare, they do occur.

While you can often fix most thermostat problems by yourself, they occasionally call for Expert help. Our HVAC Experts are ready to assist you when you need us. We’re merely a call away at 954-736-4314.

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

What Type of Thermostat Do I Have?

There are three types of thermostats:

Manual—This is the typical dial-shaped thermostat. You won’t have error codes with this kind, but it’s also the least efficient for lowering utility expenses.
Programmable—This thermostat has a digital screen and arrows you use to choose your desired temperature. You can also set daily programs to lower the temperature when you’re at work and set it higher when you return.
Smart—You won’t have to make any programs on this thermostat, as it picks up on your routine. It intuitively adjusts the temperature when you or family members are gone to help you save on energy costs. You can also change the temperature anywhere using your phone or other Wi-Fi-enabled device.

As you’re aware the majority of technologically advanced things, there are common glitches that might happen. The majority of of these problems don’t need pro support and are simple to fix by yourself.

Common Honeywell Thermostat Troubleshooting Issues

Every Honeywell thermostat has a unique kind of codes assigned to the problems that take place.

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

Here are some of the most common Honeywell thermostat problems. These are applicable to the following programmable thermostats:

Display is Blank

If the screen is clear on your programmable thermostat, you could need to put in new batteries. If that doesn’t fix the malfunction or you use a smart thermostat, there could be a wiring issue.

Next, you should make sure the power is flowing for your furnace or air handler. Confirm the switch by the indoor unit is in the “on” position.

In addition to that, you should confirm all furnace cabinet or air handler doors/panels are sturdily in place.

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

While it’s less common, a blank screen may signify you should install a new thermostat.

Comfort Equipment Won’t Turn On

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

In the summer, confirm you put the thermostat beneath the ambient temperature. In the winter, verify it’s higher. This sounds absurd, but we’ve seen it take place many times.

Confirm the power switch by your indoor system is in the “on” position. You should also comfirm the cabinet doors or panels are tight on your furnace cabinet or air handler. An unsecured panel can trigger the safety switch, stopping current to the equipment.

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

“Cool On” or “Heat On” is Flashing

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

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

If these words or the icon is pulsing, your thermostat is in a five-minute delay state. This setting keeps your equipment from bad short cycling. This may occur if you lose power.

Honeywell Thermostat-Specific Error Codes

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

164—Heat pump needs service. Call Service Experts Heating & Air Conditioning at 954-736-4314 for help.
168—Wi-Fi radio error. Reach 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 occur.
173—Thermostat temperature sensor error. Contact Lyric technical support at 800-633-3991.
175—AC power restarted. No action needed.
181/182—Put in a new air filter. Clear the thermostat by hitting “dismiss” after installing a new filter.
184—Put in a new humidifier pad. Clear the display by tapping “dismiss” after putting in a clean pad filter.
185—Replace dehumidifier filter. Clear the monitor by touching “dismiss” after installing a new filter.
187—Clean or replace ventilator filter. Clear the display by tapping “dismiss” after installing a new filter.
188/189—Replace UV bulb. Call Service Experts Heating & Air Conditioning at 954-736-4314 for support.
210—Register online for exterior temperature. Download the Lyric app to do this step and ensure proper thermostat operation.
388—Register online for remote access and exterior temperature. Download the Lyric app to complete 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 select new Wi-Fi network.
508—Wi-Fi not set. Get the Lyric app and follow the procedure to connect your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005)

164—Heat pump needs service. Reach Service Experts Heating & Air Conditioning at 954-736-4314 for assistance.
168—Wi-Fi radio error. Call Service Experts Heating & Air Conditioning at 954-736-4314 for help.
170—Internal memory error. Contact Service Experts Heating & Air Conditioning at 954-736-4314 for help.
171—Set date and time. Finish these settings so scheduling can work.
173—Thermostat temperature sensor error. Contact Service Experts Heating & Air Conditioning at 954-736-4314 for assistance.
175—AC power reconnected. No action necessary.
177—Indoor temperature sensor error. Reach Service Experts Heating & Air Conditioning at 954-736-4314 for assistance.
178—Outdoor temperature sensor error. Call Service Experts Heating & Air Conditioning at 954-736-4314 for assistance.
181/182—Install a new air filter. Clear the display by touching “dismiss” after installing a fresh filter.
183—Rinse humidifier tank and replace water filter. Clear the thermostat by touching “dismiss” after finishing these procedures.
184—Replace humidifier pad. Clear the display by tapping “dismiss” after installing pad filter.
185—Install a new dehumidifier filter. Clear the screen by touching “dismiss” after installing a clean filter.
186—Clean ventilator core. Clear the monitor by tapping “dismiss” after doing this task.
187—Wash or install a new ventilator filter. Clear the screen by tapping “dismiss” after buying 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 correct thermostat operation.
388—Register online for remote access and outdoor temperature. Use the Lyric app to complete 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 pick new Wi-Fi network.
508—Wi-Fi not set up. Download the Lyric app and follow the process 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 steps, our professionals are available to assist you. Reach us at 954-736-4314 and we’ll arrive rapidly to figure out the problem.

If you use an aging thermostat, today is a good time to think about a new device. Thermostat technology has advanced lately Ask us for more details on how smart thermostats can make your home comfier while helping save on energy costs throughout the year.