This is a brand new probe, used only for about three weeks. The heater is set to turn on when the water reads 78.5 F and off at 79. This was all going great until my probe has started saying that the water is 74 degrees in the mornings these past couple days!! What the heck? How could it possibly get there if the heater is set to run long before this drop in temperature??
What could be causing this?
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