How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the leading thermostat brands, and we proudly install them on a regular basis in Richmond. They’re durable and dependable. In addition, Honeywell is regularly enhancing its technology, bringing more features for your house.

However, every thermostat can experience issues at times. Due to this, we’ve put together this informative guide to go over troubleshooting.

While you can usually repair the majority of thermostat problems alone, they often require Expert support. Our HVAC Experts are available to support you when you need us. We’re only a call away at 804-548-4480.

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

What Model of Thermostat Do I Have?

There are three kinds of thermostats:

  • Manual—This is the classic dial-shaped thermostat. You won’t experience error codes with this one, but it’s also the least efficient for lowering energy expenses.
  • Programmable—This thermostat includes a digital screen and arrows you use to choose your desired temperature. You can also use daily programs to lower the temperature when you’re at work and set it higher when you get back.
  • Smart—You won’t have to make any programs on this thermostat, since it learns your schedule. It instinctively raises and lowers the temperature when you or other household members are gone to help you save on energy costs. You can also adjust the temperature anywhere on your phone or other Wi-Fi-enabled device. 

As is the case with the majority of technologically advanced solutions, there are common glitches that may take place. The majority of of these issues don’t require pro support and are simple to repair by yourself.

Common Honeywell Thermostat Problems

Every thermostat has an exclusive set of codes matching the malfunctions that happen.

Think how simple it can be to repair a computer by restarting it. For the most part, correcting a thermostat can be just as easy.

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

Display is Blank

If the monitor is clear on your programmable thermostat, you might need to get new batteries. If that doesn’t fix the malfunction or you use a smart thermostat, there may be a wiring malfunction.

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

In addition to that, you should make sure all furnace cabinet or air handler doors/panels are securely secured.

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

Less frequently, a blank screen might indicate you will need to buy a new thermostat.

Heating and Cooling System Won’t Work

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

When it’s hot, verify you set the thermostat lower than the ambient temperature. When it’s cold, verify it’s higher. This sounds goofy, but we’ve seen it happen a lot of times.

Make sure the power switch by 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 trip the safety switch, diverting power to the unit.

Heating or cooling still won’t turn on? Confirm circuit breakers haven’t flipped and that your HVAC system isn’t displaying error codes.

“Cool On” or “Heat On” is Flickering

To begin, make sure your thermostat is switched to “cool” or “heat.”

Then, ensure it’s telling the right equipment to turn on. This is often shown by “cool on,” “heat on” or a picture.

If this set of words or the picture is pulsing, your thermostat is in a five-minute delay status. This mode keeps your unit from harmful short cycling. This may happen if your power is interrupted.

Honeywell Thermostat-Specific Error Codes

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

  • 164—Heat pump needs service. Call Eveready Service Experts at 804-548-4480 for support.
  • 168—Wi-Fi radio error. Contact Lyric technical support at 800-633-3991. 170—Internal memory error. Call Lyric technical support at 800-633-3991.
  • 171—Set date and time. Complete these settings so scheduling can occur.
  • 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 display by hitting “dismiss” after putting in a fresh filter.
  • 184—Install a new humidifier pad. Clear the display by hitting “dismiss” after installing a new pad filter.
  • 185—Install a new dehumidifier filter. Clear the screen by touching “dismiss” after putting in a new filter.
  • 187—Clean or replace ventilator filter. Clear the display by touching “dismiss” after installing a new filter.
  • 188/189—Install a new UV bulb. Call Eveready Service Experts at 804-548-4480 for support.
  • 210—Register online for outdoor 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 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 set. Use the Lyric app and follow the procedure to link your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005) 

  • 164—Heat pump needs service. Call Eveready Service Experts at 804-548-4480 for assistance.
  • 168—Wi-Fi radio error. Reach Eveready Service Experts at 804-548-4480 for support.
  • 170—Internal memory error. Call Eveready Service Experts at 804-548-4480 for help.
  • 171—Set date and time. Finish these settings so scheduling can work.
  • 173—Thermostat temperature sensor error. Call Eveready Service Experts at 804-548-4480 for help.
  • 175—AC power resumed. No action necessary.
  • 177—Indoor temperature sensor error. Contact Eveready Service Experts at 804-548-4480 for help.
  • 178—Outdoor temperature sensor error. Reach Eveready Service Experts at 804-548-4480 for support.
  • 181/182—Replace air filter. Clear the monitor by touching “dismiss” after putting in a new filter.
  • 183—Clean humidifier tank and install a new water filter. Clear the thermostat by touching “dismiss” after doing these steps.
  • 184—Get a new humidifier pad. Clear the screen by tapping “dismiss” after adding a new pad filter.
  • 185—Install a new dehumidifier filter. Clear the monitor by tapping “dismiss” after putting in a fresh filter.
  • 186—Wash ventilator core. Clear the screen by touching “dismiss” after completing this task.
  • 187—Rinse or get a new ventilator filter. Clear the monitor by hitting “dismiss” after installing a new filter.
  • 188/189—Install a new UV bulb. Get in touch with Eveready Service Experts at 804-548-4480 for support.
  • 210—Register online for exterior temperature. Use 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 finish 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 select new Wi-Fi network.
  • 508—Wi-Fi not connected. Get the Lyric app and follow the procedures to connect your thermostat.

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

Our Experts are Here to Provide Assistance

If you’re still experiencing issues after trying the troubleshooting steps, our pros are ready to assist you. Reach us at 804-548-4480 and we’ll be out rapidly to diagnose the problem.

If you have an aging thermostat, today is a fantastic time to consider a replacement. Thermostat technology has advanced lately Ask us for more information on how smart thermostats can make your residence more convenient while helping save on energy costs year-round.

Contact Us