How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the top thermostat manufacturers, and we proudly install them on a usual basis in Winnipeg. They’re durable and trustworthy. Also, Honeywell is frequently advancing its technology, offering more features for your household.

However, all thermostats can experience issues at times. As a result, we’ve compiled this valuable handbook to walk you through troubleshooting.

While you can usually repair most thermostat troubles on your own, they often call for Expert support. Our heating and cooling Experts are available to support you when you need us. We’re only a call away at 204-800-0613.

Let’s begin the process by determining what type of thermostat your house has.

What Kind of Thermostat Do I Have?

There are three models of thermostats:

  • Manual—This is the classic dial-shaped thermostat. You won’t run into error codes with this type, 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 determine your desired temperature. You can also use daily programs to decrease the temperature when you’re at work and increase it when you come home.
  • Smart—You won’t have to set any programs on this thermostat, because it learns your schedule. It intuitively raises and lowers the temperature when you or loved ones are away to help you save on energy expenses. You can also raise or lower the temperature anywhere on your phone or other Wi-Fi-enabled device. 

As you’re aware the majority of technologically advanced products, there are common glitches that can take place. Many of these situations don’t call for pro assistance and are uncomplicated enough to fix on your own.

Common Honeywell Thermostat Issues

Each thermostat has a special set of codes matching the glitches that take place.

Think how uncomplicated it can be to repair a computer by restarting it. Many times, troubleshooting a thermostat can be just as uncomplicated.

Here is a guide to the most encountered Honeywell thermostat problems. These are applicable to 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 trouble or you have a smart thermostat, there may be a wiring malfunction.

Next, you should check the power is on 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 secured.

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

Less frequently, an empty monitor can mean you need to replace your thermostat.

Comfort System Won’t Turn On

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

In the summer, make sure you schedule the thermostat beneath the ambient temperature. In the winter, verify it’s higher. This sounds silly, but we’ve seen it happen many times.

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

Heating or cooling still won’t run? Make sure circuit breakers haven’t flipped and that your HVAC system isn’t displaying error codes.

“Cool On” or “Heat On” is Flickering

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

Then, verify it’s signaling the correct unit to turn on. This is usually indicated by “cool on,” “heat on” or an illustration.

If this set of words or the picture is flashing, your thermostat is in a five-minute delay state. This feature keeps your system from bad short cycling. This can happen if your power is interrupted.

Honeywell Thermostat-Specific Error Codes

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

  • 164—Heat pump needs service. Call Winnipeg Supply Service Experts at 204-800-0613 for assistance.
  • 168—Wi-Fi radio error. Call Lyric technical support at 800-633-3991. 170—Internal memory error. Call 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 needed.
  • 181/182—Replace air filter. Clear the screen by hitting “dismiss” after adding a fresh filter.
  • 184—Put in a new humidifier pad. Clear the screen by tapping “dismiss” after adding a clean pad filter.
  • 185—Install a new dehumidifier filter. Clear the screen by tapping “dismiss” after installing a clean filter.
  • 187—Rinse or replace ventilator filter. Clear the monitor by hitting “dismiss” after adding a fresh filter.
  • 188/189—Install a new UV bulb. Ring Winnipeg Supply Service Experts at 204-800-0613 for help.
  • 210—Register online for exterior temperature. Use the Lyric app to do this step and ensure correct thermostat operation.
  • 388—Register online for remote access and outdoor temperature. Get the Lyric app to do 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 steps to link your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005) 

  • 164—Heat pump needs service. Call Winnipeg Supply Service Experts at 204-800-0613 for help.
  • 168—Wi-Fi radio error. Reach Winnipeg Supply Service Experts at 204-800-0613 for support.
  • 170—Internal memory error. Call Winnipeg Supply Service Experts at 204-800-0613 for support.
  • 171—Set date and time. Complete these settings so scheduling can work.
  • 173—Thermostat temperature sensor error. Call Winnipeg Supply Service Experts at 204-800-0613 for help.
  • 175—AC power reconnected. No action required.
  • 177—Indoor temperature sensor error. Reach Winnipeg Supply Service Experts at 204-800-0613 for assistance.
  • 178—Outdoor temperature sensor error. Reach Winnipeg Supply Service Experts at 204-800-0613 for support.
  • 181/182—Replace air filter. Clear the screen by tapping “dismiss” after adding a clean filter.
  • 183—Clean humidifier tank and replace water filter. Clear the screen by touching “dismiss” after doing these procedures.
  • 184—Install a new humidifier pad. Clear the thermostat by touching “dismiss” after installing pad filter.
  • 185—Get a new dehumidifier filter. Clear the thermostat by hitting “dismiss” after putting in a new filter.
  • 186—Wash ventilator core. Clear the monitor by touching “dismiss” after doing this task.
  • 187—Wash or get a new ventilator filter. Clear the display by hitting “dismiss” after installing a new filter.
  • 188/189—Get a new UV bulb. Contact Winnipeg Supply Service Experts at 204-800-0613 for assistance.
  • 210—Register online for outside temperature. Get the Lyric app to do this step and ensure correct thermostat operation.
  • 388—Register online for remote access and outdoor 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 choose new Wi-Fi network.
  • 508—Wi-Fi not configured. Download the Lyric app and follow the procedures to connect your thermostat.

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

Our Experts are Ready to Help

If you’re still having issues after trying the troubleshooting process, our pros are available to help. Give us a call at 204-800-0613 and we’ll be out quickly to determine the problem.

If you have an aging thermostat, right now is a good time to think about a new thermostat. Thermostat technology has come a long way in recent years Ask us for more details on how smart thermostats can make your house better while helping save on energy expenses year-round.

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