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Old 01-21-2012, 11:38 AM   #1
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Trane XL 19 in alarm


I have a XL19 unit making a clicking noise emitting from the defroster board CNT04335, and the red led is flashing twice per second.

The unit had leaked freon, located and repaired on thursday. Recharged system with 17 pounds as noted on panel, with good pressures. Noticed compressor unit was cycling more then normal along with the clicking and led flash.

I remember the tech saying the other day when he put the gauges on the system was in a vacuum. Which is understandable since we were able to locate the leaking schradder valve and replace the stem, soaped it for bubbles and appeared okay. The part that has me baffled is why didn't the low pressure switch shut the unit down. The LO compress was still running, however the HI compress was locked out has it was really hot. As the system was running upon the tech's arrival you could hear it trying to engage the HI compress. We had to wait for it to cool down before putting freon in system.This work was done Thursday evening.

Checked system Friday morning before going to work and everything appeared fine. Friday evening, came home checked system and discovered the clicking noise and the red led flashes twice per second. Is this low pressure again?

Woke up this morning after running system on emergency heat for the night and outside unit still clicking. I turned all the thermostats to off. Outside unit is still clicking. I killed the power at the panel box to silence it. This will also erase the double red blinking light, which I have already relayed to the service tech. Just trying to preserve the diagnostic help the tech needs, while protecting my investment.

Running on emergency heat now.

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Old 01-21-2012, 01:45 PM   #2
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Trane XL 19 in alarm


17 lbs of freon? is it a 20 ton unit?

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Old 01-21-2012, 02:08 PM   #3
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Trane XL 19 in alarm


~snorke~ seventeen pounds.... Just kidding. I had to think for a minute why it has so many pounds of refrigerant. Very high seer.

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Old 01-21-2012, 03:29 PM   #4
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Trane XL 19 in alarm


You guys had me scared for a moment. The model number is 2TWZ9060A1000AB. It calls for HCFC-22, 17lbs. 13oz. Wrote this off the plate mounted on the unit.
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Old 01-21-2012, 04:33 PM   #5
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Trane XL 19 in alarm


it's a 19 seer so it would have more refrigerant than a comparable five ton at a lower seer.

How ever if you had a tech out recently I'd call him back. He missed something.
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Old 01-21-2012, 04:44 PM   #6
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Trane XL 19 in alarm


Thanks for the feedback. The tech is coming back out on Monday. This is the same thing it was doing that prompted the initial call. So I would assume it is low on pressure again, and probably has a leak somewhere. I read that 2/second flash is low pressure. The clicking is from the relay trying to activate the compressor. Just guessing here now, and trying to get educated.
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Old 01-21-2012, 04:49 PM   #7
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Trane XL 19 in alarm


Kill power to the heat pump and run on back up heat. The compressor will ruin if it runs on low gas press. Even it it has a low press control.
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Old 01-21-2012, 05:05 PM   #8
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Trane XL 19 in alarm


I switched over to emergency heat last night. The outside compressors are not running. I did not pull the electric disconnect to the compressor outside. Fairly simple to disconnect if you think I should until they get here.
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Old 01-21-2012, 05:07 PM   #9
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I would.
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Old 01-21-2012, 05:19 PM   #10
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Trane XL 19 in alarm


Take care of. Thanks.
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Old 01-23-2012, 12:10 PM   #11
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Trane XL 19 in alarm


So, the service techs showed this morning. The guages were showing high readings on the high side, with low to nothing, on the low pressure side. They contacted the Trane Rep. which he said to replace the expansion valve and the driers, so we are waiting on the parts. The date stamped on the unit are 07/2003, so hopefully the parts are covered under warranty.
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Old 01-28-2012, 11:20 PM   #12
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Trane XL 19 in alarm


My update, had the TXV and bulb sensor replaced. Removed the factory drier and replaced with a new one. Pulled a good vacuum, let it stand for hold test, alls good. Loaded system with 18 lbs, checkd gauges, and fired it up. That was some good hot air blowing out, and running great so far. Should see some relief in the electric bill now.

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