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Honeywell Thermostat Error Codes – Troubleshooting Guide (2024)

honeywell thermostat connection failure e43

As we know that there are lots of smart appliances that, even after lots of testing, produce errors. These errors are explained by the manufactures of the relevant product so the users don’t face any difficulty while solving them.

Same is the case with Honeywell thermostats. There are several error codes which the users might come across once during their usage time duration. In this article we will be discussing each and every one of that error which are commonly faced by others.


honeywell thermostat reset codes

Following are the error codes generated by Honeywell thermostats.

  • Error e42
  • Error e43
  • Error e2
  • Error e40
  • Error e02
  • Error e1
  • Error 11n

These are just the numbers of the errors which will be visible to the users. But each error code has a specific meaning behind it. We will be discussing those meanings in the next section of this article.


thermostat code 11n

Give a proper read to this section of the article in order to know more about the errors.

  • ERROR E42:

Honeywell thermostat error e42 occurs when the Wi-Fi doesn’t show up an IP address to your thermostat. If IP isn’t shown then it means no connection will be established. The common reason for the occurrence of this error is the incapability of your router to perform DHCP. DHCP stands for Dynamic Host Configuration Protocol. This protocol automatically sends an IP address to your thermostat which is needed to establish a connection.


Honeywell Wi-Fi thermostat connection failure error can be solved by Enabling Your Router to perform DHCP. In addition to this, it is a good practice to perform a power cycle on your router and perform initial setup steps. After this you will be ensured that the DHCP protocol is enabled to do the job.

  • ERROR E02:honeywell thermostat error e1

Honeywell thermostat e02 error occurs when you have entered the wrong password to establish a connection with the router. The duration of this error code is 30 seconds. After this time, you will be redirected to the password screen so you could re-enter the password.


The solution of this error is the easiest one. You just need to enter the correct password when trying to establish a connection.

  • ERROR 40:

Error 40 is basically an indication to inform that the heating or air-conditioning monitoring system has found a malfunction. There are possible reasons for the occurrence of this error.

  • The compressor has become faulty and isn’t working properly
  • The outdoor unit has been shut for a long period of time
  • Coolant issues
  • Problems with fan motors


It is better to check for clogged air filters and ensuring the proper working of breaker and other internal components as well. After you have reset the thermostat and the error still persists then it is time to get help from a technician.

  • ERROR E43:honeywell connection failure e43

Honeywell thermostat error e43 is shown when the thermostat is not able to establish a successful connection with your Wi-Fi. There are two possible reasons for it; either your Wi-Fi isn’t connected to the Wide Area Network or the Ethernet cable hasn’t been plugged in properly. Honeywell e43 connection failure error should be solved as soon as possible so you could enjoy the perks of your thermostat.


Honeywell connection failure e43 can be solved by rebooting the router. Unplug the router and leave it for about 30-40 seconds. After this duration, plug back the router and you will see that the issue has vanished.

But issues like Honeywell thermostat keep turning OFF or screen not responding wouldn’t be solved this easy. You will have to put in some extra effort for this.

  • ERROR E1:

Honeywell thermostat e1 error occurs when the sensors of your thermostat have become faulty or damaged. Due to this it won’t be able to sense the indoor as well as outdoor temperatures.


If the sensors are damaged then it is recommended that you hire a technician and get the damaged sensors replaced quickly.

  • ERROR 11N:

Thermostat code 11n is shown when the thermostat is unable to communicate to the heating and cooling units. This happens when the wiring has gone faulty or when the equipment itself is defective.


Hire an expert to examine where exactly the issue lies. If one of the wires have gone faulty then the technician will replace it soon but if the issue lies within the thermostat then you will have to get it replaced.

  • ERROR E2:

The occurrence of error e2 might be due to two reasons. The first one is that one of the sensors might have become faulty or the router got disconnected before the thermostat completed its setup process.


Solving error e2 will require you to hire an outside help. If the sensors are damaged then they will get replaced soon enough. Also if the issue occurred because of the router thing then all you need to do is make sure the router stays ON during the setup process of your thermostat.


Q – Which Error Relates To The Connection Failure Honeywell?
A – Error e43 is responsible for the connection failure of your Honeywell thermostat.

Q – What Is Honeywell Thermostat Connection Failure E43 Error Code?
A – This error code is shown to the user when his thermostat is unable to establish a successful connection with home Wi-Fi.

Q – Honeywell Thermostat Reset Codes, What Is The Procedure?

STEP 1 – Press β€œSystem” option
STEP 2 – Keep pressing the blank box present in the center
STEP 3 – Change the numbers to the right to 1 while and the numbers on the left should be changed to 0710


Knowing about these error codes and their relevant fixes is really important. This will allow you to troubleshoot any problem which comes across your way. We have provided a detailed description on all the relevant error codes, make sure to give this article a proper read!


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