How to Troubleshoot Honeywell Thermostat Errors

Honeywell is one of the leading thermostat manufacturers, and we proudly install them on a usual basis in Birmingham. They’re durable and dependable. Plus, Honeywell is regularly enhancing its technology, offering more features for your family.

However, every thermostat can run into troubles every now and then. As a result, we’ve compiled this informative guide to go over troubleshooting.

While you can typically fix most thermostat troubles alone, they occasionally call for Expert help. Our heating and cooling Experts are ready to support you when you need us. We’re only a call away at 205-267-0023.

Let’s get started with the process by determining what type of thermostat your home has.

What Model of Thermostat Do I Have?

There are three models of thermostats:

  • Manual—This is the older dial-shaped thermostat. You won’t run into error codes with this kind, but it’s also the least efficient for reducing heating and cooling bills.
  • Programmable—This thermostat has a digital screen and arrows you touch to choose your desired temperature. You can also set daily programs to lower the temperature when you’re gone and raise it when you get back.
  • Smart—You won’t have to set any programs on this thermostat, as it picks up on your routine. It automatically adjusts the temperature when you or family members are gone to help you save on utility costs. 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 regular malfunctions that can take place. The majority of of these issues don’t need professional support and are easy to fix on your own.

Common Honeywell Thermostat Problems

Every thermostat has an exclusive set of codes assigned to the glitches that take place.

Think how simple it can be to fix a computer by restarting it. In many instances, diagnosing a thermostat can be just as simple.

Here is a guide to the most common Honeywell thermostat errors. These are applicable to the following programmable thermostats:

Display is Blank

If the screen is empty on your programmable thermostat, you may need to get new batteries. If that doesn’t solve the issue or you have a smart thermostat, there may be a wiring malfunction.

Next, you should ensure the power is on for your furnace or air handler. Make sure the switch close to the indoor system is in the “on” position.

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

A panel that isn’t tight may activate the safety switch, which cuts off power to the system.

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

Comfort System Won’t Start

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

When it’s hot, make sure you put the thermostat beneath the ambient temperature. When it’s cold, confirm it’s higher. This sounds silly, but we’ve seen it occur a lot of times.

Confirm the power switch close to your indoor equipment is in the “on” position. You should also check the cabinet doors or panels are closed on your furnace cabinet or air handler. An open panel can activate the safety switch, stopping electricity to the equipment.

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

“Cool On” or “Heat On” is Blinking

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

Then, check it’s signaling the right equipment to turn on. This is usually shown by “cool on,” “heat on” or a picture.

If these words or the picture is pulsing, your thermostat is in a five-minute delay mode. This setting stops your equipment from bad short cycling. This may take place if your power is interrupted.

Honeywell Thermostat-Specific Error Codes

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

  • 164—Heat pump needs service. Call Norrell Service Experts at 205-267-0023 for help.
  • 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. Finalize these settings so scheduling can run.
  • 173—Thermostat temperature sensor error. Contact Lyric technical support at 800-633-3991.
  • 175—AC power restarted. No action needed.
  • 181/182—Install a new air filter. Clear the monitor by tapping “dismiss” after adding a new filter.
  • 184—Replace humidifier pad. Clear the screen by tapping “dismiss” after adding a new pad filter.
  • 185—Install a new dehumidifier filter. Clear the monitor by touching “dismiss” after adding a fresh filter.
  • 187—Rinse or replace ventilator filter. Clear the thermostat by hitting “dismiss” after putting in a clean filter.
  • 188/189—Get a new UV bulb. Ring Norrell Service Experts at 205-267-0023 for support.
  • 210—Register online for outdoor temperature. Get the Lyric app to finish this step and ensure correct thermostat operation.
  • 388—Register online for remote access and exterior temperature. Download the Lyric app to do this step and ensure proper 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 configure your thermostat.

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

Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005) 

  • 164—Heat pump needs service. Call Norrell Service Experts at 205-267-0023 for support.
  • 168—Wi-Fi radio error. Contact Norrell Service Experts at 205-267-0023 for help.
  • 170—Internal memory error. Reach Norrell Service Experts at 205-267-0023 for help.
  • 171—Set date and time. Finalize these settings so scheduling can operate.
  • 173—Thermostat temperature sensor error. Call Norrell Service Experts at 205-267-0023 for help.
  • 175—AC power restored. No action necessary.
  • 177—Indoor temperature sensor error. Call Norrell Service Experts at 205-267-0023 for assistance.
  • 178—Outdoor temperature sensor error. Call Norrell Service Experts at 205-267-0023 for assistance.
  • 181/182—Install a new air filter. Clear the monitor by hitting “dismiss” after putting in a new filter.
  • 183—Wash humidifier tank and add a new water filter. Clear the screen by hitting “dismiss” after finishing these steps.
  • 184—Install a new humidifier pad. Clear the display by hitting “dismiss” after adding a new pad filter.
  • 185—Replace dehumidifier filter. Clear the screen by touching “dismiss” after adding a fresh filter.
  • 186—Clean ventilator core. Clear the thermostat by hitting “dismiss” after completing this task.
  • 187—Wash or get a new ventilator filter. Clear the monitor by hitting “dismiss” after buying a new filter.
  • 188/189—Get a new UV bulb. Contact Norrell Service Experts at 205-267-0023 for help.
  • 210—Register online for outdoor temperature. Use the Lyric app to complete this step and ensure accurate 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. Verify 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 process to connect your thermostat.

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

Our Experts are Ready to Help

If you’re still experiencing issues after going through the troubleshooting process, our professionals are ready to support you. Give us a call at 205-267-0023 and we’ll come to your house as fast as we can to determine the malfunction.

If you rely on a dated thermostat, today is a great time to think over a replacement. Thermostat technology has advanced in recent years Ask us for more info on how smart thermostats can make your residence more convenient while helping save on energy costs year-round.

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