Swimables SW-41-053 generic thermistor for MasterTemp and Max-E-Therm pool heatersSwimables Generic Thermistor for MasterTemp Max-E-Therm Heater, SW-41-053 In stock$5099
Swimables SW-41-053 generic thermistor for MasterTemp and Max-E-Therm pool heaters
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Swimables Generic Thermistor for MasterTemp Max-E-Therm Heater, SW-41-053

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$5099
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Quick overview

  • Generic replacement Sold as an aftermarket thermistor rather than the original manufacturer part.
  • For MasterTemp and Max-E-Therm Listed as the thermistor for the MasterTemp and Max-E-Therm heater range.
  • Reads water temperature A thermistor is the sensor the control board uses to know how hot the water actually is.
  • A common cause of odd readings A drifting or failed thermistor makes the heater misread temperature and cycle wrongly.
  • Swimables part SW-41-053 Ordered by that part number, and cross referenced against the original sensor.
  • Genuine option exists The manufacturer thermistor for these heaters is stocked separately if you prefer the original part.
Full description and specifications ↓

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Product details

The Swimables SW-41-053 is a generic thermistor for MasterTemp and Max-E-Therm pool heaters. It is an aftermarket replacement, not the original manufacturer sensor.

What a thermistor does

A thermistor is a resistor whose resistance changes predictably with temperature. The heater control board reads that resistance and turns it into a water temperature. Every decision the heater makes about firing, holding and shutting down comes back to that one reading.

Why they get replaced

Sensors sitting in pool water drift and eventually fail. When they do, the heater is working from bad information: the panel shows a temperature the water is not at, the heater short cycles, will not reach setpoint, or throws a sensor fault. Replacing the thermistor is the usual first move once the wiring has been checked.

Generic or original

This is the generic version. The original manufacturer thermistor for the same heater electrical system is stocked separately if you would rather fit the factory part.

Specifications
Brand Swimables
Manufacturer part number SW-41-053
UPC 810108820383
Type Thermistor, water temperature sensor
Fits MasterTemp and Max-E-Therm heaters
Build Generic aftermarket replacement
Listed under Pentair parts
Shipping weight 0.09 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Is this a genuine manufacturer part?
No. It is sold as a generic aftermarket thermistor. The original manufacturer thermistor for the Max-E-Therm and MasterTemp heater electrical system is stocked as a separate item.
Which heaters is it for?
It is listed as the thermistor for MasterTemp and Max-E-Therm heaters.
What does the thermistor do?
It is the temperature sensor. Its resistance changes with water temperature, and the control board reads that to decide when the heater should fire and when it has reached setpoint.
What are the signs it has failed?
Temperature readings that do not match the water, a heater that short cycles or will not reach setpoint, or a sensor fault shown on the control panel.
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