Title: Basic unit works great
Product review: We purchased a TX500B about a year ago for our forced-air system.We have had no problems with buttons not responding, nor lost settings. The one "problem" has to do with how the "hold" feature works when required for an extended period (greater than the end of the current time period). Our unit came with supplemental instructions (an insert) on how to do this. It works, but is less than intuitive.
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