Product Overview

The Pentair Heat Pump & Heater Thermistor Probe (471566) is the temperature sensor your heater's control board relies on to read water temperature. When a thermistor fails or drifts, the heater can show incorrect temperatures, overshoot or undershoot your set point, or post sensor faults. This genuine Pentair replacement restores accurate readings so your heater or heat pump can control water temperature correctly.

⚠️ Important Purchase Notice

This listing is for the thermistor probe only. Match part number 471566 / 471566Z and confirm your heater or heat pump model before ordering. Turn off power to the unit before servicing; installation should be done by a qualified pool professional. Inspect the shipment upon arrival and report any damage promptly.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov.

Ideal For

• Replacing a failed or inaccurate water temperature thermistor.
• Clearing sensor-related faults traced to a bad probe.
• Pentair MiniMax NX heaters and ThermaFlo Titanium heat pumps.
• Service techs stocking common heater repair parts.

Key Features

• Genuine Pentair replacement part.
• Water temperature thermistor probe.
• Fits MiniMax NX 150 through 400 heaters.
• Fits ThermaFlo Titanium heat pumps.
• For pool and spa heating equipment.

Benefits

• Restores accurate water temperature readings.
• Helps the heater hold your set point instead of overshooting or cycling.
• Low-cost fix that can get a heater running again.
• OEM fit for a straightforward swap.

Compatibility

Pentair lists this probe for MiniMax® NX STD, NT TSI and NT LN heaters in sizes 150, 200, 250, 300, 350 and 400, and for ThermaFlo® Titanium heat pumps. Pool360 also associates it with Pentair UltraTemp® heat pumps and UltraTemp ETi® hybrid heaters. Confirm against your unit's parts list or existing probe before ordering.

Installation or Upgrade Context

Turn off power to the heater or heat pump. Locate the existing water temperature thermistor, disconnect it from the control board harness and remove it from its mount, then install the new probe in the same position and reconnect it. Restore power and confirm the displayed water temperature is reasonable. Follow your heater's service manual for the exact location and procedure.

What’s Included

• One Pentair thermistor probe (471566).

Specifications

Warranty

This part carries a 60-day manufacturer warranty, subject to Pentair's terms. Pool Supply Depot can provide proof of purchase for warranty claims.

Customer Q&A

How do I know my thermistor is bad?

Common signs are a temperature reading that's clearly wrong, a heater that won't hold set point, or a sensor fault on the display. Your heater's service manual has the test procedure.

Is 471566Z the same part?

Yes. Pool360 sells this probe under part number 471566Z with the same UPC.

Does it fit UltraTemp heat pumps?

Pool360 associates it with UltraTemp models, but check your unit's parts list to confirm.