I have two ZTech ts40b Beutler wall thermostats tied to a single AC / heat systems. Starting a few weeks ago, both the units started having problems with time setting - the time will be reset at midnight every night, as if it lost power. no matter how many times I set it, after midnight it will get reset and ask me to set the time.
there is no battery I could find to replace. I am not familiar with these models.
Can anyone help me with this?
thank you in advance.
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