I've noticed that a few weeks after I set the time on my Rain bird ESP Modular controller, the time seems to run about a minute faster than the time I entered. I've noticed more than once. Does anyone know what may be causing this?
Yes, the controller was probably programmed to metric time instead of standard time.
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Or I just made that up.
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Controllers don't always keep accurate time. 1 minute every few weeks is not uncommon. Not much you can do about it.