A Honeywell smart thermostat is an easy way to better manage how you use your heating and cooling. But like any mechanical system, you might occasionally run into a problem. With its digital display, Honeywell smart thermostats can display an error code that trained technicians use to figure out what's happening. Here are several of the most known error codes you could see on your Honeywell smart thermostat.
Error Code e42 for Honeywell Thermostats
You may receive this error code in the event that your home’s Wi-Fi connection did not supply an IP address for the thermostat to hook up to. This can take place if a router fails to complete the Dynamic Host Configuration Protocol, or DHCP. This process automatically supplies the required IP address for your thermostat to connect.
How to Fix Honeywell Thermostat Error e42
You can fix error code e42 by verifying that your router is enabled for DHCP. When it does, you usually also have to power cycle the router and complete the initial setup process again with the thermostat. Doing so should ensure the DHCP is transmitted and connects to your smart thermostat.
Honeywell Error Code e02
Error code e02 appears whenever the password for connecting to your home’s Wi-Fi router was incorrect. After this error code is displayed for 30 seconds, the thermostat’s digital display automatically transitions to the Wi-Fi setup screen so you can attempt to enter the password again.
How to Fix Honeywell Thermostat Error e02
All you'll need to do to resolve error e02 is make sure you’re entering the correct Wi-Fi password when setting up the thermostat.
Honeywell Error Code 40
Error code 40 can show up when the thermostat is informed that a heat pump or air conditioner’s monitoring system has identified a malfunction. For the most part, this occurs once the compressor isn’t working despite being instructed to. But this error code can also appear if power is disconnected from the outdoor unit for a long period of time. A “High Pressure Fault” error, caused by blocked airflow, can lead to this error code. Lastly, you might experience error code 40 if there’s an issue with the coolant, the outdoor unit’s fan motor or the motor’s starting capacitor.
How to Fix Honeywell Thermostat Error 40
You can inspect the air filter for signs of a clog, as well as the breakers and indoor unit’s blower for normal operation. If you reset the thermostat and error code 40 reappears, it’s best to contact an experienced technician.
Honeywell Thermostat Error e43
If a Honeywell thermostat shows error code e43, it can’t communicate with the router, and by extension your Wi-Fi. This may happen if the router’s ethernet cable isn’t plugged in or it isn’t communicating with your wide area network (WAN).
How to Fix Honeywell Thermostat Error e43
Restart the router by unplugging it and leaving it that way for a short period. The thermostat could also be disconnected if you have recently changed the password or the Wi-Fi’s SSID, which is the name you provide it.
Error Code e1 for Honeywell Thermostats
Thermostats employ sensors to identify the temperature outdoors and indoors. If a sensor malfunctions, you could see error code e1 appear on your Honeywell smart thermostat.
How to Fix Honeywell Thermostat Error e1
A trained technician can replace the sensor and reboot the thermostat, which should take care of error code e1.
Honeywell Error Code 11n
Error code 11n may appear if the thermostat can’t recognize a heating or cooling unit. This can mean that the equipment itself is faulty and unable to communicate with the thermostat. This sometimes happens when the wiring is defective or even if the thermostat has failed.
How to Fix Honeywell Thermostat Error 11n
A qualified technician can utilize a voltmeter to assess if there’s a poor electrical connection. If the wiring on your existing HVAC system is bad, the technician can replace it. If the thermostat itself is the source of the error code, it should probably be replaced.
Error Code e2 for Honeywell Thermostats
If you’ve noticed error code e2 appear on your Honeywell smart thermostat, it could mean a few different things. In some cases, one of the sensors responsible for detecting the temperature isn’t operating properly. Other times, it means the router was disconnected from its power source before the thermostat could complete the setup process.
How to Fix Honeywell Thermostat Error e2
If the error code is caused by sensor failure, a technician should troubleshoot and switch out the damaged sensor. Any time the problem comes from disconnected power, all you’ll have to do is make sure the router stays on during the setup process.
