How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the top thermostat brands, and we proudly install them on a usual basis in Calgary. They’re sturdy and trustworthy. Also, Honeywell is constantly advancing its technology, resulting in more features for your home.

Still, each thermostat can experience errors at one time or another. Due to this, we’ve compiled this useful guide to go over troubleshooting. While Honeywell thermostat troubleshooting problems are rare, they happen.

While you can typically repair most thermostat problems on your own, they often require Expert help. Our HVAC pros are here to assist you when you need us. We’re just a call away at 587-315-5271.

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

What Kind of Thermostat Do I Have?

There are three kinds of thermostats:

Manual—This is the classic dial-shaped thermostat. You won’t have error codes with this one, but it’s also the least efficient for reducing heating and cooling bills.
Programmable—This thermostat has a digital screen and arrows you press to set your desired temperature. You can also choose daily programs to reduce 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, since it adjusts to your day. It automatically raises and lowers the temperature when you or loved ones are away to help you save on heating and cooling bills. You can also raise or lower the temperature anywhere using your phone or other Wi-Fi-enabled device.

As you’re aware the majority of technologically advanced solutions, there are common malfunctions that can occur. Many of these problems don’t call for professional assistance and are easy to solve on your own.

Common Honeywell Thermostat Troubleshooting Errors

All Honeywell thermostats have an exclusive set of codes that correspond to the issues that happen.

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

Here is a listing the most reported Honeywell thermostat problems. These include the following programmable thermostats:

Display is Blank

If the monitor is empty on your programmable thermostat, you might need to put in new batteries. If that doesn’t take care of the malfunction or you have a smart thermostat, there may be a wiring issue.

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

In addition to that, you should confirm all furnace cabinet or air handler doors/panels are securely fastened.

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

Less frequently, a blank monitor might signify you will need to install a new thermostat.

HVAC System Won’t Work

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

In the summer, verify you set the thermostat lower than the current temperature. When it’s cold, make sure it’s higher. This sounds silly, but we’ve seen it happen many times.

Ensure the power switch near 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 trigger the safety switch, cutting off power to the unit.

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

“Cool On” or “Heat On” is Flickering

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

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

If this phrase or the illustration is blinking, your thermostat is in a five-minute delay mode. This mode keeps your equipment from harmful short cycling. This may happen if you lose electricity.

Honeywell Thermostat-Specific Error Codes

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

164—Heat pump must be serviced. Call A1 Chesney Service Experts at 587-315-5271 for support.
168—Wi-Fi radio error. Call 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 take place.
173—Thermostat temperature sensor error. Reach Lyric technical support at 800-633-3991.
175—AC power resumed. No action needed.
181/182—Install a new air filter. Clear the screen by hitting “dismiss” after adding a fresh filter.
184—Install a new humidifier pad. Clear the display by hitting “dismiss” after putting in a new pad filter.
185—Put in a new dehumidifier filter. Clear the thermostat by touching “dismiss” after adding a new filter.
187—Wash or replace ventilator filter. Clear the thermostat by tapping “dismiss” after adding a new filter.
188/189—Replace UV bulb. Call A1 Chesney Service Experts at 587-315-5271 for support.
210—Register online for exterior temperature. Download the Lyric app to complete this step and ensure correct thermostat operation.
388—Register online for remote access and outside temperature. Download the Lyric app to do 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. Get the Lyric app and follow the steps to link your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005)

164—Heat pump requires service. Contact A1 Chesney Service Experts at 587-315-5271 for assistance.
168—Wi-Fi radio error. Contact A1 Chesney Service Experts at 587-315-5271 for support.
170—Internal memory error. Contact A1 Chesney Service Experts at 587-315-5271 for support.
171—Set date and time. Complete these settings so scheduling can work.
173—Thermostat temperature sensor error. Reach A1 Chesney Service Experts at 587-315-5271 for help.
175—AC power restored. No action necessary.
177—Indoor temperature sensor error. Reach A1 Chesney Service Experts at 587-315-5271 for help.
178—Outdoor temperature sensor error. Contact A1 Chesney Service Experts at 587-315-5271 for assistance.
181/182—Replace air filter. Clear the screen by touching “dismiss” after installing a new filter.
183—Rinse humidifier tank and add a new water filter. Clear the display by tapping “dismiss” after completing these steps.
184—Install a new humidifier pad. Clear the screen by hitting “dismiss” after adding a new pad filter.
185—Get a new dehumidifier filter. Clear the monitor by touching “dismiss” after installing a fresh filter.
186—Wash ventilator core. Clear the thermostat by hitting “dismiss” after doing this task.
187—Wash or replace ventilator filter. Clear the monitor by tapping “dismiss” after installing a new filter.
188/189—Get a new UV bulb. Get in touch with A1 Chesney Service Experts at 587-315-5271 for support.
210—Register online for exterior temperature. Download the Lyric app to do this step and ensure correct thermostat operation.
388—Register online for remote access and exterior temperature. Get the Lyric app to do this step and ensure accurate thermostat operation.
399—No Internet. Verify 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. Use the Lyric app and follow the procedures to connect your thermostat.

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

Our Experts are Here to Provide Assistance

If you’re still experiencing issues after working through the troubleshooting list, our professionals are available to assist you. Reach us at 587-315-5271 and we’ll be out quickly to figure out the issue.

If you use a dated thermostat, now is a fantastic time to think about a new thermostat. Thermostat technology has come a long way in recent years Ask us for more information on how smart thermostats can make your home more comfortable while helping save on utility expenses throughout the year.

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