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  1. S

    pentair mastertemp 400

    when you turn it on it just shows a temp of 104. nothing else
  2. S

    pentair mastertemp 400

    I replaced the the thermistor and the problem still exists
  3. S

    pentair mastertemp 400

    when i turn on heater it always says 105 degrees. water is only 80 degrees. green light on panel is working. no error lights lit on front or back of control panel. The control panel was just replaced and is only 2 months old? PLEASE HELP