Product Overview

The Pentair 42001-0053S Thermistor is a genuine Pentair replacement water-temperature sensor for Pentair MasterTemp, Max-E-Therm and Sta-Rite pool and spa heaters. The thermistor senses the water temperature and sends it to the heater's control system, which is essential for maintaining accurate water temperature and efficient heater operation.

Ideal For

Owners of Pentair MasterTemp, Max-E-Therm or Sta-Rite heaters with a faulty or inaccurate temperature reading

Service technicians replacing a failed heater thermistor

Routine heater electrical system repairs

Key Features

Genuine Pentair OEM part: direct replacement under part number 42001-0053S.

Water temperature sensing: reports water temperature to the heater's control system.

Accurate temperature control: helps the heater maintain the set temperature and operate efficiently.

Built for pool environments: designed to withstand the conditions found in pool equipment pads.

Specifications

Warranty & Compatibility

Compatibility Notes

The 42001-0053S is used in the electrical system of Pentair MasterTemp and Max-E-Therm heaters, and in Sta-Rite heaters. Confirm your heater model and the part number shown in your heater's parts list before ordering.

Installation Notes

Turn off all power and gas to the heater before servicing. Disconnect the old thermistor from the control board harness, remove it from its sensor well, and install the new thermistor in the same location. Follow the Pentair heater manual for your model. Service should be performed by a qualified technician.

Customer-Facing Q&A

Q: What is the part number of this thermistor?
A: The Pentair part number is 42001-0053S.

Q: What is the UPC?
A: The UPC is 022315209817.

Q: Which heaters does the 42001-0053S fit?
A: It is used in Pentair MasterTemp and Max-E-Therm heaters and in Sta-Rite heaters. Check your heater's parts list to confirm.

Q: What does the thermistor do?
A: It senses the water temperature and sends that reading to the heater's control system so the heater can maintain the set temperature.