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This is ingrown pool and spa. Soa has overflow into pool. All pentair equipment. Filter has 4 cartridges. Heater is Master Temp 400. I control everything by remote app. I have checked HTL and thermostatic. Both look new. Pool is 2 years old. Heater come on but when temp on heater hits...

What needs to be done to correct the different temperatures form the equipment. The panels shows 92 but the heater shows 104.