Did you clear 126 through ISU 0706?

 

No. I'm not too familiar with these communicating systems just yet.

 

Is this the XL950 thermostat? If so, update the firmware to 3.0. Previous versions have caused random 126 events.

Error 126 is loss of communication. I would suggest the following.

1. Confirm all low volt connections tight and secure.

2. Clear error 126 from history.

3. Check for 12v DC at data terminals on all pieces of equipment.

This may not completely fix your problem but it's a good place to start.

 

Had a no cool call on a trane. 20i. 900 stat


Alert Code Addendum 18-HD32D2-1/69-2009

 

How far is the condenser from the AH? Is the Tstat wire brand new with new with install?


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Also, does there happen to be a clean effects with the unit?


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No clean effects filter. Condenser is around 30-35 ft from handler. Ahu in attic. It is a tcon900. I made sure to cut and reconnect wires at condenser. This problem didn't start until the lizard shorted the board. Also how do I update the firmware on that stat? Will the unit still run while showing 126? ALso something strange, I forget what code I had up but the cool icon went missing from the system menu until I removed and replaced the stat. Then it showed back up

 

No firmware update needed with Tcont900.

Sounds like your loosing communication to the outdoor unit somehow.

 

I'm planning on attending the next training class for Rheem communicating equip and would look forward to a trane class also.

 

Yeah. Is it possible that the shorting of the 12v data terminal to 24v Ac transformer feed screwed the stat ?

 

You can warranty the stat. But I think the Tstat wire is being interrupted to the condenser. Maybe switch some wires around if you have some available


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I uploaded two pictures to my albums. They are of the board where the lizard made contact.

 

I couldn't figure out how to post the images in the post

 

The system was installed in 2010. I'm going to check the warranty status. Can I run cat5 wire to the components instead of stat wire? I thought stranded wire was preferred over the solid stat wire anyway.

 

If so, I may just run cat5 to all equipment

 

Is it normal for the cool icon to disappear from the system menu ?

 

Had a similar issue recently and it ended up being the blower motor. Check the display at your air handler for faults because those are usually true. If your condenser and air handler boards comm lights (Amber) are showing 3 flashes than its telling you that all 3 pieces AH/CU/STAT are being recognized. My recommendation if the wire to the condenser needs to be change is to run a pair of stranded 16g wires. Tstat wire is too risky IMO

 

I had a similar situation a couple weeks ago.

I had a bad stat wire to the outdoor unit causing code 126. Fixed, watched it run and left. That night the customer called the tech on call saying it was giving a code 89.

He went out there the next morning, found the breaker tripped, the first stage compressor sounded like it was trying to pump nuts and bolts. The thermostat was showing error code 126 again, too.

After enough cycling of the breaker style disconnect to the outdoor unit, he discovered it didn't work anymore. He pops off the cover to find a lizard shorted the line voltage and blew the breaker.

That caused a voltage drop so the compressor would not start, and the error code 89 was from loss of 24v to the outdoor unit.

Always check your line voltage and look for a voltage drop. It could be a crispy lizard causing all of your issues.

Not saying this is your problem but it's a reminder that it's a little more difficult to isolate issues with this equipment as it's all tied together.


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Is cat5 cable ok to run to theses communicating systems ?

 

I highly doubt that.

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The instructions state a minimum wire size of 18AWG

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I thought they required stranded wire and since communicating I figured cat5 would work.

 

I've never seen any installation with stranded thermostat wire. The instructions only mention 18 to 22. I meant to say 22AWG was the smallest recommended wire size in my last post.

Cat 5 is something like 30AWG, isn't it?

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I will just run new wire and warranty the stat. Then see what happens. I talked to a local that installs a crap load if these 20i (use to, no more) and he said they are very problematic. I won't plan on selling any but I may dabble in the rheem communicating systems.

 

They really aren't that problematic. I think its mostly poor installation practices with running thermostat wire and a lot of misunderstanding of the error codes.

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