This thermostat is at least 10-11 years old I believe. At one point it had a temperature differential of either 2 or 3 degrees. Somewhere along the line it started working with a one degree differential. I have no manual for this and the instructions in the lid don’t say how to change it.

Anyone know where to find a manual or know how to change it? The only labels I can find on it other than “Maple Chase” on the front, are on the back side and are displayed as such:

Serial #
93 093