This has been in the house from before I moved in 11 years ago. I've had some issues with it over the years, but generally it works ok. My current problem is that it is supposed to raise the temperature from what is displayed by pressing the Plus button. For the time period programmed in it should read 20 dgs, but it is showing 17dgs with a flame sign, and will not increase when I press +. In all other respects it behaves according to the settings.