Hello, first lets start with the obvious. Is the battery's in correctly? Second what brand of thermostat is it? A lot of brands have a reset button (behind the face cover). It usually a small black button that says beside of it RESET. If you still have the instruction manual you may refer to it to see if you have this feature. It's always the possibility you may have a bad thermostat also. Let's hope not. Try these two things first before you replace the stat. J
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Hello, first lets start with the obvious. Is the battery's in correctly? Second what brand of thermostat is it? A lot of brands have a reset button (behind the face cover). It usually a small black button that says beside of it RESET. If you still have the instruction manual you may refer to it to see if you have this feature. It's always the possibility you may have a bad thermostat also. Let's hope not. Try these two things first before you replace the stat. J