I have a Noma programmable thermostat Model 52-2558-8 (4 wire connection) I have been using it for 2 years. My problem is when it is set to go on A/C and is set on 25 degrees the setting move up on me. This morning I got up and the setting had moved to 29 degrees C. This is not the first time it has happened. I set it back to 25 and later in the day it has moved up again. No one has tampered with it. There is just me and my wife here and she enjoys the A/C. This has just started to happen since the warm weather has come.

Chuck:confused:

Either it is trying to run the program as it is programmed for, or it is a bad thermostat. If I had a dollar for every Hunter/Noma/Lux 'stat I replaced under 3 years of age I could retire soon. OK 5 dollars.

Double check your program, I agree with northerheat, they aren't really very high qaulity thermostats.