How to Troubleshoot Honeywell Thermostat Errors
Honeywell is one of the top thermostat producers, and we proudly install them on a usual basis in the U.S.. They’re long-lasting and dependable. Plus, Honeywell is constantly advancing its technology, resulting in more features for your family.
Still, each thermostat can experience issues at one time or another. Due to this, we’ve put together this valuable manual to go over troubleshooting. While Honeywell thermostat troubleshooting problems are rare, they do occur.
While you can usually solve the majority of thermostat problems by yourself, they often require Expert assistance. Our home comfort pros are available to assist you when you need us. We’re just a call away at 866-397-3787.
Let’s get started with the process by figuring out what type of thermostat your residence has.
What Kind of Thermostat Do I Have?
There are three kinds of thermostats:
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- Manual—This is the older dial-shaped thermostat. You won’t have error codes with this kind, but it’s also the least efficient for saving on energy expenses.
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- Programmable—This thermostat has a digital screen and arrows you press to choose your desired temperature. You can also set daily programs to lower the temperature when you’re away and increase it when you get back.
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- Smart—You won’t have to set any programs on this thermostat, as it learns your day. It intuitively changes the temperature when you or other household members are out and about to help you save on heating and cooling 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 products, there are common problems that may happen. The majority of of these troubles don’t need professional support and are simple to fix alone.
Common Honeywell Thermostat Troubleshooting Issues
Every Honeywell thermostat has a special group of codes matching the troubles that happen.
Think how easy it can be to fix a computer by restarting it. Many times, troubleshooting a thermostat can be just as easy.
Here is a guide to the most encountered Honeywell thermostat problems. These apply to the following programmable thermostats:
Display is Blank
If the monitor is blank on your programmable thermostat, you could need to get new batteries. If that doesn’t take care of the issue or you rely on a smart thermostat, there could be a wiring issue.
Next, you should check the power is on for your furnace or air handler. Confirm the switch by the indoor unit is switched “on”.
In addition to that, you should make sure all furnace cabinet or air handler doors/panels are sturdily fastened.
An unsecured panel may trigger the safety switch, which disconnects power to the equipment.
Infrequently, a blank screen can indicate you will need to buy a new thermostat.
Comfort System Won’t Start
Ensure that your thermostat is switched to “cool” or “heat,” not “off.”
In the summer, verify you set the thermostat beneath the current temperature. When it’s cold, verify it’s higher. This sounds goofy, but we’ve seen it happen lots of times.
Make sure the power switch by your indoor unit 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, stopping current to the unit.
Unit still won’t start? Confirm circuit breakers haven’t flipped and that your HVAC unit isn’t experiencing error codes.
“Cool On” or “Heat On” is Flickering
First, make sure your thermostat is switched to “cool” or “heat.”
Then, check it’s signaling the appropriate system to turn on. This is often demonstrated by “cool on,” “heat on” or an illustration.
If this phrase or the illustration is flashing, your thermostat is in a five-minute delay status. This mode keeps your system from bad short cycling. This may occur if you lose power.
Honeywell Thermostat-Specific Error Codes
Honeywell Lyric™ T5 Wi-Fi (RCHT8612WF/RCHT9510WFW)
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- 164—Heat pump must be serviced. Call Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for assistance.
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- 168—Wi-Fi radio error. Reach Lyric technical support at 800-633-3991. 170—Internal memory error. Contact Lyric technical support at 800-633-3991.
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- 171—Set date and time. Complete these settings so scheduling can occur.
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- 173—Thermostat temperature sensor error. Contact Lyric technical support at 800-633-3991.
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- 175—AC power resumed. No action necessary.
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- 181/182—Put in a new air filter. Clear the screen by tapping “dismiss” after installing a new filter.
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- 184—Install a new humidifier pad. Clear the display by hitting “dismiss” after installing a fresh pad filter.
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- 185—Put in a new dehumidifier filter. Clear the thermostat by hitting “dismiss” after installing a fresh filter.
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- 187—Wash or install a new ventilator filter. Clear the thermostat by hitting “dismiss” after installing a clean filter.
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- 188/189—Install a new UV bulb. Ring Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for assistance.
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- 210—Register online for exterior temperature. Use the Lyric app to complete this step and ensure proper thermostat operation.
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- 388—Register online for remote access and outside temperature. Download the Lyric app to do this step and ensure correct thermostat operation.
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- 399—No Internet. Verify your network settings.
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- 400—No Wi-Fi signal. Wait for the thermostat to reconnect or pick new Wi-Fi network.
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- 508—Wi-Fi not set. Get the Lyric app and follow the steps to configure your thermostat.
For more specifics, see this thermostat’s user manual.
Honeywell T6 Pro Smart Programmable Thermostat (TH411OU2005)
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- 164—Heat pump needs service. Contact Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for help.
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- 168—Wi-Fi radio error. Call Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for assistance.
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- 170—Internal memory error. Reach Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for assistance.
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- 171—Set date and time. Finish these settings so scheduling can run.
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- 173—Thermostat temperature sensor error. Reach Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for assistance.
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- 175—AC power restored. No action necessary.
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- 177—Indoor temperature sensor error. Contact Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for support.
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- 178—Outdoor temperature sensor error. Call Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for help.
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- 181/182—Install a new air filter. Clear the monitor by touching “dismiss” after adding a fresh filter.
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- 183—Rinse humidifier tank and add a new water filter. Clear the display by hitting “dismiss” after doing these steps.
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- 184—Get a new humidifier pad. Clear the monitor by tapping “dismiss” after adding a new pad filter.
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- 185—Install a new dehumidifier filter. Clear the thermostat by touching “dismiss” after installing a clean filter.
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- 186—Clean ventilator core. Clear the display by hitting “dismiss” after doing this task.
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- 187—Wash or install a new ventilator filter. Clear the monitor by hitting “dismiss” after getting a new filter.
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- 188/189—Replace UV bulb. Reach Service Experts Heating, Air Conditioning & Plumbing at 866-397-3787 for assistance.
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- 210—Register online for exterior temperature. Use the Lyric app to finish this step and ensure correct thermostat operation.
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- 388—Register online for remote access and outdoor temperature. Get the Lyric app to do this step and ensure accurate thermostat operation.
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- 399—No Internet. Verify your network settings.
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- 400—No Wi-Fi signal. Wait for the thermostat to reconnect or select new Wi-Fi network.
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- 508—Wi-Fi not configured. Use the Lyric app and follow the steps to connect your thermostat.
For more specifics, check this thermostat’s user manual.
Our Experts are Available to Provide Support
If you’re still having issues after going through the troubleshooting list, our professionals are available to assist you. Call us at 866-397-3787 and we’ll come to your house as fast as we can to diagnose the issue.
If you rely on an older thermostat, right now is a great time to consider a replacement. Thermostat technology has gotten better over the last few years. Ask us for more details on how smart thermostats can make your residence more convenient while helping save on heating and cooling expenses year-round.