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Troubleshooting Honeywell Thermostat Errors - PartsAPS

troubleshooting honeywell thermostat errors

Honeywell is one such label present in almost every household on the American continent. Along with its straightforward management software, the company's products adapt well to your indoor climate demands. However, problems may arise. Then you have to follow some Honeywell thermostat troubleshooting tricks. In our blog, we are going to explore a few of the most important troubleshooting tips that you must know.

Troubleshooting Honeywell Thermostat Errors

When it comes to problems with your Honeywell thermostat, you just have to resolve the issue yourself. Even if you don't have knowledge on these thermostats, just other appliances in your house, you can try out a couple of Honeywell thermostat troubleshooting tips that can get you back in business.

Analog Thermostat Troubleshooting

Honeywell analog thermostats are available in round or square shapes depending on the model. Generally, these thermostats have Heat, Cool, or Settings and an Auto or OFF switch position for the fan.

To test for heat, you have to turn the thermostat to the "Heat" position and set the temperature as high such as 80 degrees F. Wait for five minutes until the furnace active. If you observe the furnace kick on, then consider it is working correctly.

Now, test for cool. Set the thermostat switch to "Cool" and the fan switch to "Auto" mode. You need to set the temperature switch at the lowest. After that, wait for five minutes and examine if cool air begins to flow. If you feel the air conditioner kicks on, it's operating properly.

If neither of these tests turns the furnace or AC ON, check the wire connections. Remove the panel and verify the small colored wires are corrected in the right way as per the wiring diagram in the manual inside the unit. It is simple to arrange the low voltage wire connections for proper operation.

If the wiring also fine, your furnace or AC has a problem. Otherwise, try replacing the old Honeywell thermostat.

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Honeywell Digital Programmable Thermostats Troubleshooting

These digital programmable thermostats are available in a variety of models. Some are designed with a keypad with digital displays, some have touch screens and some models can let you control the thermostat from your smartphone, tablet, or computer. Here are some of the most common problems with digital programmable and solutions.

Honeywell Thermostat Troubleshooting No Display

No display is the common problem that will occur in most digital thermostats. Some modern furnaces have a door switch that activates the whole device when the door is properly closed. When the door isn't properly closed, the door switch isn't depressed, and the thermostat loses power.

The thermostat batteries may be dead. If they are dead, you have to replace the batteries. Some models have an alert that indicates via message on the screen when to replace the batteries. If the Honeywell thermostat not working after a battery change, consult the service center.

The circuit breaker might be tripped on your air conditioning unit. Flip the circuit breaker switch to the OFF mode and then back to the ON position. 

Honeywell Thermostat Not Working Properly

If the thermostat is controlling the temperature as per requirement even having the active display, you have to check the following:

Low voltage wires are disconnected

Make sure to install the small colored wires that connected from the thermostat to various components in their right positions. If they couldn't be arranged properly, your thermostat won't run. Some models require only three-wire hookups, while others need up to six or more. The number of hookups depending on the number of components your system having. When you want to rearrange the loose wires, refer to the color-coded diagram for your unit in the manual.

Clock may be set incorrectly

There may be a chance of internal clock function changing after power outages. While the battery holds the clock settings when your system loses power, but this doesn't work correctly. So, you have to verify the clock is set to the correct date and time. If your's is an electronic programmable thermostat, the wrong setting will prevent the system from operating correctly. However, you should correct the time and date based on the model number.

Incorrect jumper settings

You have to verify the jumper settings by removing the cover. In some models, you need to set the right position based on the type of your air conditioner, furnace or heat pump. Some more will require the jumper in the HG setting for a gas or oil furnace and HE for an electric furnace. These settings ensure that the fan activates when switched to automatic mode.

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Problem with Air Conditioner or Furnace

It is also possible that the issue is not with the Honeywell thermostat at all. But with AC or furnace or any other component like humidifier or air exchanger unit.

You have to test the COOL and HEAT modes as given above. If you feel either of these are not caused for the problem. It is more likely to be found in other HVAC system components. Hence, with the help of an HVAC technician, you have to fix these issues.

Honeywell Thermostat Error Codes

164- Heat pump needs service.

168 - Wifi radio error.

170 - Internal memory error.

171 - Set date and time, You have to finalize the settings for scheduling.

173 - Error with thermostat temperature sensor.

175 - AC power restored.

181/ 182 - Replace air filter. You have to clear the monitor by pressing "dismiss" after placing a clean filter.

184 - Humidifier pad replacement needs to be done. And, clean the display after installing a new one.

185 - Requires a new humidifier filter.

187 - Wash or install a new ventilator filter.

188/ 189 - It requires a new UV bulb.

210 - Register online for outdoor temperature. By using the Lyric app, you can complete this process.

388 - Register for remote access and exterior temperature through the Lyric app.

399 - No internet error so that confirm your network settings.

These error codes useful for common models especially Honeywell Lyric T5 Wi-Fi.

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Frequently Asked Questions

Is there a reset button on my Honeywell thermostat?

Yes, you have a reset button for the Honeywell thermostat. To get the reset option, click on the MENU on the screen. Now, press the "<" or ">" buttons until you see the RESET button. By using arrow keys, you can get the Schedule option to reset schedules on the thermostat.

How do I know if my Honeywell thermostat is bad?

If you observe any of these symptoms, consider that your thermostat is bad.

  • Your AC or Furnace won't turn ON.
  • The thermostat is not responded.
  • Your HVAC system not turned off and runs constantly.
  • The thermostat setting and room temperature doesn't match.

What is recovery mode on Honeywell thermostat?

You can see this thermostat recovery mode in all brands along with Honeywell. In this recovery mode, the thermostat will work towards getting a new temperature that is warmer or cooler than the outside.


While these following tips may not fix every problem you will deal with, but certainly, these are the right steps to take in order to guide you on what to do next. Both analog and digital Honeywell thermostat models are very dependable. In many cases, you can go through troubleshooting Honeywell thermostat errors and fix them. If nothing seems to be doing, it is the best choice to consult a service expert. You can buy new Honeywell thermostats at PartsAPS. Here, you can purchase Honeywell parts as well for your HVAC equipment.

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