Desperately looking for some help here. I have an older 1994 Trane XE 1200. Ran fine for the last two years, had it serviced before starting it up this year and it hasn't worked since. Here's what happens.
Keep in mind that the outside fan is always on and the air handler is always on, seems to be no issue with those. After leaving it OFF for some time, when I start it up the system with the thermostat, the outside fan AND compressor turn on and the air blows 20 degrees colder at the supply than the return. After only about 20 minutes, the compressor turns off and the air blows at only a 5 degree difference. It'll stay this way for hours, then the compressor will come on again for maybe 15 minutes then turn off, then no compressor again for hours.
Outside temperature is 85 and it's humid. There was one day when it was 75 outside and it worked fine all day.
Any idea what this might be? The tech who did the annual service only tells me that I need a new unit. I think it might be electrical, like a capacitor. Is this something anyone has seen before? I need to get this unit functioning properly within a week and I'd rather not rush to replacing it.
Thanks in advance! I spent hours searching the web and couldn't find the exact problem discussed.