Ask Me Help Desk - I installed an RTH2300 this winter to replace an old mercury thermostat.

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I installed an RTH2300 this winter to replace an old mercury thermostat.

I installed an RTH2300 this winter to replace an old mercury thermostat. It worked fine for the heating season. I turned it to Cool for the first time today and my AC and furnace blower will not turn off. Keeps cooling even though I have it set at 80 degrees and the temperature reads 76.

Get out your install instructions,, go over it a few times if needed,, sounds like something not wired right

Comment on wmproop's post

Or not programmed right

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