I posted last year about my Trane XR12 3ton A/C unit model 2TWR2036A1000AB. It was running all the time, couldn't keep the temp in the house and finally couldn't cool at all. The unit manufacture date is Oct 2005 installed new in our May 2006 house. The inside unit is up in our attic and the coils were replaced last year as they had rusted/corroded away already. The outside unit is on the southern (yeah I know....HOT) side of the house. We live in Florida in southeast Hillsborough county which is near Tampa.
We are back to the same old problem. House is set for 76 and is heating up to 79, unit runs all the time until sun goes down. We are getting 60F at the register nearest to the unit and 61F at the room farthest away. The tstat is a Honeywell and is mounted on the hall wall at the opposite end of the house from the unit. The house is 1600 sq ft. block construction. At the time someone mentioned our well and sulfer problems. We had a well aerator installed within 3 weeks of the last repair and it is working very well so the sulfer can no longer be the problem.
This unit always seems to run constantly even to maintain. Even when things seem fine it runs for 15+ minutes and only shuts down for 2-3 minutes. Our old house was on the same lot and was frame above a crawl space and we didn't have any problems like this. The electical bills now are really high in summer.
Ok. I think I gave all the details...hopefully... lol Is there a possibility this unit is too small for the house? There is a cathedral ceiling in the family room/kitchen. (about 20'x30') I'm really starting to wonder about Trane...
The parts were warranty work but I got yanked hard on the labor/trip fees. I can't afford this annual mess. I was reading on another post about possible tstat and/or second stage problems. On our tstat when I turn it down, as the digital number drops, it flashes "heat". When I stop pushing the button it just goes back to it's normal "cool on". It never says anything about 2nd stage or anything else. Of course I don't know if I have a second stage system so maybe that's why...
Any help is greatly appreciated. If I missed any details, let me know. Sorry for the length of the post, I was trying to cover everything.