Trane Thermostat Error Code 126 (I Found Proven Fix!)

Are you facing Trane Thermostat Error Code 126? Is your Trane thermostat stopped working due to this error code? 

Don’t worry, this guide will walk through all the possible causes and solutions to this error code.

Like Lennox, Honeywell, and many other brands, Trane also deals with HVAC systems. Trane company was founded in 1885, oh then, I wasn’t even born. So the company is very old and has manufactured many pieces of equipment and devices that users are taking benefit of.

But, like others, this brand also has a good share of issues and errors. In this guide, we are going to discuss one of them which is error code 126.

So, let’s dig into the knowledge base and fix this error code.

What does Trane Thermostat Error Code 126 indicate?

Trane Thermostat Error Code 126 usually indicates a communication hindrance between your HVAC unit and the thermostat, while in a Trane 950, this error code usually means a low-temperature lockout. The best and easy step to fix this error is to reset the whole system.

As for the possible causes, you can admit a communication hindrance between your HVAC unit and the thermostat. Moreover, a broken electrical circuit could also be a reason for getting this error.

Why does Trane Error Code 126 Appears; Possible Causes?

When I faced this error, I started searching for the causes of it; luckily I got some. Let’s see these causes so that it could be clear to you too.

The Furnance failed to respond to the thermostat; To operate the furnace properly, it needs to respond properly to the thermostat and if it fails, error code 126 could appear.

A power surge; There could be a power surge and this could cause the thermostat to stop responding.

The Fuse; Due to a high voltage or fluctuation in the electricity, the fuse on the outside unit has blown. This could also be a reason for getting the error code 126.

The Outdoor Transformer; Sometimes, the error could be seen if your outdoor transformer is not performing.

Wires; Wire connects the whole system and if there is a loose connection or a broken wire in the circuit, you may face error 126.

How to Fix Trane Thermostat Error Code 126?

As we have mentioned that the possible causes for this error could be a broken electrical circuit and a communication issue between the system and the thermostat, you can follow these steps to fix it:

Check the Electrical Circuits

If you know, how to deal with wirings and multimeters, you can check the electrical circuit between your unit and the thermostat. There is much possibility that a circuit breakage has happened.

Check and fix the breakage and see if the error code has been resolved or not, it should be now. 

If you don’t know dealing with wirings or multimeters, call an HVAC specialist. 

Try Resetting the Whole System

The best and easy step is resetting the whole system to fix the Trane Thermostat Error Code 126. Many users have found this trick works for them, and so can you too. 

1. Turn off your unit completely.
2. Wait for a while.
3. Turn all the things back ON.

This should fix the error code. If it does not, call an expert.

Frequently Asked Questions

How Do I Clear A Trane Error Code?

The best way to clear a Trane error code is to reset the whole system, or if you are facing an issue with your thermostat, reset your thermostat. If this does not work, call a professional or contact Trane support.

How Do I Reset A Trane Thermostat?

Follow these steps:

1. Turn OFF the HVAC system.
2. In the breaker box, find the switch wired to the thermostat.
3. Once find the switch, flip this switch to the OFF position.
4. Wait for 1 minute.
5. Flip the switch to the ON position.

If you have XL824/850/1050 wireless thermostat:

1. Turn OFF the HVAC unit.
2. Press Menu (On the screen of the thermostat).
3. Now, select settings.
4. Next, select Reboot and then Yes to confirm your choice.
5. Now, give the system a few minutes to complete the reset process.

Does A Trane Thermostat Have Batteries?

Well, Trane has many thermostats, some of them have batteries whereas some do not.