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    Pentair Mastertemp 400 displaying wrong temp - Lesson Learned and shared.

    Same thing just happened to me with a Mastertemp 250. I had opened it to replace the igniter - which was very easy to do. After starting it up though, the temperature was super low. Read 44F when the water was 68F. Then it turned off when the temp read 120F. It has been raining here like crazy...