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Thermostat Issue?


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Hi All,

I have two C4 Thermostats for about 4 years now. They are running 1.8.2 and I have watched my electric bill rise and my units running longer and longer. Both of them turn off after reaching the set temp, but sometimes have to climb to 3 or 4 degrees above the turn on temp before they click on again causing the units to run longer to cool it down. Attacheded a screen shot of the setup... If anyone has any ideas it would be a great help

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Ditto, I had similar issues, and sold mine.

Before giving up try:

1. Make sure it is wired correctly.

2. Make sure there is a common wire, not on power stealing

3. Calibrate to a thermometer.

Even with that I had the same problems. One fact I was able to find is that the undershoot/overshoot is a little misleading. Info is posted at:


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