The problem is back, but with a new twist !
The unit worked perfectly for several weeks. As you saw from the above posts, the original problem was failure to shut off unless I maxed out the thermostat. I replaced the thermistor, and it worked perfectly. Then the past few days, it was not keeping the room at/near the set temp. Now the compressor won't come on unless you set the thermostat at the lowest setting (and then runs continuously).
I am pretty convinced I need to replace one of the circuit boards (there are two), but I just don't know which one. Logic tells me to replace the one that the thermistor plugs into, but it also serves as the display. I don't usually like to throw parts at something until it's fixed, so ANY help would be appreciated.
Also, is there any way to alter the title of this post to indicate that the problem is back (might get more readers??)