Thermistor Temperature Sensor Compatible with Pentair Mastertemp and Sta-Rite Pool and Spa Heater 42001-0053S. This replacement sensor is designed for use with Pentair Mastertemp 400, 125, and Sta-Rite heaters, ensuring accurate temperature readings and proper heater function. It resolves E01 errors and maintains safe operation by regulating the water temperature.

• Compatibility: Works with Pentair Mastertemp 400, 125, and Sta-Rite heaters.
• E01 Error Fix: Replace this sensor if the Pentair Mastertemp Control Board shows an E01 error code.
• Purpose: Measures the water temperature within the manifold, ensuring system safety by keeping the temperature below 104°F.
• Location: Found on the black manifold, connected by two wires.