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This error code is for low temp lockout. Turn power off to outside and inside unit. That will reset lockout fault.
Oh you already tried the power off.
Typically it happens because the temp is low and doesn't need to kick on?
hmmmm give me just a minute to look into this.
yes I am just a moment please bare with me :)
The 126 is loss of communication between the equipment. This equipment "talks" back and forth, In the event the communication is interrupted you must turn off both the indoor and outdoor unit and then back on.
Then the thermostat will search once again for equipment.
Most of the time a full indoor/outdoor reset works. In the event it does not it would require a service call from a Trane dealer.
You will likely find a blown fuse or power issue in the outdoor unit.
Which in turn led to a communication fault.
Can you test the fuses you put in?
I am sorry I dont follow what do you mean by codes?
Do you have that information available to follow?
Ok let me see what I can find give me just a second.
Have you done any recent updates on your thermostat software?
Can you try checking to see if you have an update in your software on it?
press your help and then about button
Ok I am going to open this up to other experts to see if they can help explain this to you.
No not at all