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Webb-Guy
Webb-Guy, HVAC Mechanic
Category: HVAC
Satisfied Customers: 934
Experience:  maitenance tech at casto
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Trane ComfortLink II, XL 20i unit. I have an error 126 -

Customer Question

Hi. Trane ComfortLink II, XL 20i unit. I have an error 126 - tried cutting power to inside and outside for 5 minutes, it didn't fix.
JA: How old is the appliance? Have you gotten error messages before?
Customer: At least 6 years old. Yes, we've gotten the messages before.
JA: Do you plan on doing the work yourself?
Customer: If I can.
JA: Anything else we should know to help you best?
Customer: That's it for now.
Submitted: 2 months ago.
Category: HVAC
Expert:  Webb-Guy replied 2 months ago.

This error code is for low temp lockout. Turn power off to outside and inside unit. That will reset lockout fault.

Expert:  Webb-Guy replied 2 months ago.

Oh you already tried the power off.

Expert:  Webb-Guy replied 2 months ago.

Typically it happens because the temp is low and doesn't need to kick on?

Customer: replied 2 months ago.
Temp is 76 or so inside now, it's set to 72.
Customer: replied 2 months ago.
There's a water-level trip thing, but that's fine, too.
Expert:  Webb-Guy replied 2 months ago.

hmmmm give me just a minute to look into this.

Customer: replied 2 months ago.
K
Customer: replied 2 months ago.
The switches are two fuses by the unit in the attic, and a pull-out thing in the box by the outdoor unit, right?
Expert:  Webb-Guy replied 2 months ago.

yes

Customer: replied 2 months ago.
Researching?
Expert:  Webb-Guy replied 2 months ago.

yes I am just a moment please bare with me :)

Expert:  Webb-Guy replied 2 months ago.

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?

Customer: replied 2 months ago.
When I plug the fuses back in for the outside unit, I hear clicking in the unit, which suggests power is happening.
Customer: replied 2 months ago.
In researching this, it looks like there are codes I can view and adjust that can correct the problem?
Expert:  Webb-Guy replied 2 months ago.

I am sorry I dont follow what do you mean by codes?

Customer: replied 2 months ago.
Provided in the control panel.
Expert:  Webb-Guy replied 2 months ago.

Do you have that information available to follow?

Customer: replied 2 months ago.
Says something about getting into installer setup, but not how to do it.
Expert:  Webb-Guy replied 2 months ago.

Ok let me see what I can find give me just a second.

Expert:  Webb-Guy replied 2 months ago.

Have you done any recent updates on your thermostat software?

Customer: replied 2 months ago.
Not that I know of.
Expert:  Webb-Guy replied 2 months ago.

Can you try checking to see if you have an update in your software on it?

Customer: replied 2 months ago.
How?
Expert:  Webb-Guy replied 2 months ago.

press your help and then about button

Customer: replied 2 months ago.
I don't see a help button.
Expert:  Webb-Guy replied 2 months ago.

Ok I am going to open this up to other experts to see if they can help explain this to you.

Customer: replied 2 months ago.
Will this cost more?
Expert:  Webb-Guy replied 2 months ago.

No not at all

Customer: replied 2 months ago.
K, thanks.