Product Overview

The Pentair Probe Thermistor MX NT (471566Z) is an OEM temperature-sensing component designed for use in Pentair heater and heat-pump systems. It monitors the pool/spa water temperature and provides accurate feedback to the control board, helping ensure safe and efficient heater operation and preventing overheating or mis-regulated cycles.

Ideal For

• Technicians replacing faulty or inaccurate temperature probes in Pentair heater/heat-pump systems.

• Pool owners whose system is showing incorrect temperature readings or intermittent safety shutdowns.

• Installations of Pentair MiniMax NT, UltraTemp, ThermalFlo, and related systems where OEM compatibility is required.

• Maintenance routines aimed at restoring performance and extending heater system life.

Key Features

• OEM Certified – specifically designed for Pentair MiniMax NT, UltraTemp, ThermalFlo and similar systems.

• Precision Temperature Sensing – ensures accurate feedback to the heater’s control logic for safe and efficient operation.

• Plug-and-Play Compatibility – direct fit replacement with no modification required.

• Durable Construction – engineered to withstand heat-pump/heater environment conditions.

• Cost-Effective Service Part – replaces the probe to avoid full component or system replacement when only the sensor is compromised.

Customer-Facing Q&A

Q: What does this thermistor probe do?
A: It senses the water temperature and relays it to the heater control board, helping the system regulate heater output, prevent overheating, and maintain safe cycling.

Q: Which heaters or heat pumps will this fit?
A: It fits compatible Pentair heater systems including MiniMax NT, ThermalFlo, UltraTemp models and other MX/NT series units. Confirm your model and part number for compatibility.

Q: Is this difficult to install?
A: No. It’s typically a straightforward replacement — remove the faulty probe, insert the new unit, secure wiring, and resume operation. Always disconnect power and follow safety procedures.

Q: What signs indicate I might need this probe replaced?
A: If your heater is showing incorrect temperature readings, frequent safety shutdowns, or erratic operation, the thermistor may be malfunctioning and replacement is recommended.

Q: Does replacing this probe improve warranty or performance?
A: While it’s a service-part replacement (not a full system warranty), installing the correct OEM probe restores accurate temperature sensing and helps your heater operate more reliably and safely.