Seltron Promatic D20 issues

I’ve set up this page to summarize a few issues I’ve run into with the Seltron Promatic D20, a weather-adjusted heating controller. I hope it will help other people diagnose and prevent similar problems. Given what follows, I recommend NOT buying this product, and if it’s any testimony to the quality of Seltron products and the company’s customer support, I can’t recommend buying other Seltron products either.

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