Polaris 3900 Sport SuperBag | 39-310 Electrical Boxes & Enclosures confirm the fault is isolated

confirm the fault is isolated to the thermistor — check for error codes in your heater's control panel that specifically indicate a temperature sensor fault

If you need less testing

Brand Equipment Line Model / Part Number Hayward SwimClear Single Element Cartridge Filter W3C150S Compatibility is based on Hayward parts documentation and available OEM records

Pentair iChlor 523010 — iChlor 15 Cell Only Flow switch replacement kit for iChlor series

Chitosan clarifier

Polaris 3900 Sport SuperBag | 39-310 Electrical Boxes & Enclosures confirm the fault is isolatedThe Polaris 39 310 SuperBag is a large, double chambered replacement filtration bag designed specifically for Polaris 3900 sport or P39 pressure side vac sweep pool cleaners. The 39 310 SuperBag is gray in color and expands to hold up to 5 liters of large and small debris within the dual zippered chambers, giving almost twice as much debris capacity as a single chamber Polaris bag. Features and Benefits: Double chambered filtration bag with 5 liters