A Honeywell smart thermostat is an easy way to optimize how you use your HVAC system. But like any mechanical system, you might sometimes run into a problem. With a digital display, Honeywell smart thermostats can provide an error code that certified technicians use to figure out what’s wrong. Here are a few of the most common error codes you could see on your Honeywell smart thermostat.
Honeywell Error Code e42
You may encounter this error code when your home’s Wi-Fi connection did not provide an IP address for the thermostat to connect to. This can take place if the router does not perform the Dynamic Host Configuration Protocol, or DHCP. This procedure automatically transmits the needed IP address for your thermostat to connect to the Wi-Fi.
- How to Fix Honeywell Thermostat Error e42: You can clear error code e42 by confirming that your router has enabled DHCP. If it does, you might also need to power cycle the router and perform the setup process again with the thermostat. Completing this task should ensure the DHCP is sent and connects to the smart thermostat.
- Honeywell Thermostat Error e02: Error code e02 appears whenever the password for accessing your home’s Wi-Fi router is incorrect. After this error code is displayed for 30 seconds, the thermostat’s digital display should automatically transition to the Wi-Fi setup screen so you can try the password again.
- How to Fix Honeywell Thermostat Error e02: All you need to do to resolve error e02 is ensure you’re typing the correct Wi-Fi password when configuring the thermostat.
Honeywell Thermostat Error 40
Error code 40 can show up when the thermostat is informed that a heat pump or air conditioner’s monitoring system has recognized a malfunction. Most often, this happens when the compressor isn’t turning on despite being directed to. But this error code could also surface if power is disconnected from the outdoor unit for an extended period of time. A “High Pressure Fault” error, caused by blocked airflow, can lead to this error code. And finally, you could experience error code 40 if there’s an issue with the refrigerant, 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 ordinary operation. If you turn the thermostat off and on again and error code 40 reappears, it’s best to get a hold of an experienced technician.
Error Code e43 For Honeywell Thermostats
If the Honeywell thermostat presents error code e43, it is failing to communicate with the router, and by extension your Wi-Fi. This can happen if the router’s ethernet cable isn’t plugged in or it isn’t communicating with the wide area network (WAN).
- How to Fix Honeywell Thermostat Error e43: Reset the router by unplugging it and leaving it that way for a short period. The thermostat may also be disconnected if you’ve recently changed the password or the Wi-Fi’s SSID, which is the name you create for it.
Honeywell Thermostat Error e1
Thermostats employ sensors to detect the temperature outdoors and indoors. If a sensor breaks down, you may notice error code e1 turn up on your Honeywell smart thermostat.
- How to Fix Honeywell Thermostat Error e1: A trained technician can swap out the sensor and reboot the thermostat, which should clear error code e1.
Error Code 11n for Honeywell Thermostats
Error code 11n could appear when the thermostat is unable to connect to a heating or cooling unit. This might mean that the equipment itself is faulty and unable to communicate with the thermostat. This sometimes happens when the wiring is bad or even if the thermostat is faulty.
- How to Fix Honeywell Thermostat Error 11n: A professional technician can use a voltmeter to find out if there’s a faulty electrical connection. If the wiring on your existing HVAC equipment is bad, the technician can replace it. In situations where the thermostat itself is the problem, it should probably be replaced.
Honeywell Error Code e2
If you see error code e2 pop up on your Honeywell smart thermostat, it might mean several different things. For example, one of the sensors responsible for detecting the temperature isn’t working properly. Other times, it means the router was disconnected from power before the thermostat completed the setup process.
- How to Fix Honeywell Thermostat Error e2: In situations where the error code is a result of sensor failure, a technician should troubleshoot and switch out the impacted sensor. If the problem stems from disconnected power, all you’ll have to do is verify the router stays on during the setup process.
