I have both rancos and helix and though some people have no problems out of their rancos I have had a couple get stuck on the E2 problem message. When they are showing this E2 error message they do not do anything and all of the heat is off. I have never had any problems out of my helix thermostats but I like all of the things that I hear about the Herpstat Pro. I do not have the Herpstat Pro but hopefully someone that does can tell you more about them or you can check out their website and get all of the info on it.

Marcus

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