pentair heater 400, only heats to 97, set to 104

Nov 23, 2014
11
Corona, ca
3 years old, runs fine but just won’t quite get hot enough.
No errors but display says “313”
Changed the thermistor on the top left of the inlet....$80 from the pool store...$20 at Amazon
No change. Same display of “313” and no errors...and still heats but doesn’t max to 104.
Up/down buttons on heater don’t change anything...stays at 313.
My phone app says set to 104 but quits in upper 90’s.
Change the board?
Fill the pool with dirt?

The part I changed:
366398B8-D065-486E-ABED-DB1BB3F09CDB.jpeg

Tom
 
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