Product Overview

The Pentair 471603 is a genuine OEM electrode flame sensor for Pentair MiniMax NT STD pool and spa heaters, models 200, 250, 300 and 400. The flame sensor sits at the burner and confirms to the ignition control that a flame is present. If the sensor is dirty, cracked or failed, the heater may light briefly and then shut down or lock out. Replacing it restores reliable flame detection and steady heater operation.

⚠️ Important Purchase Notice

This is a burner and ignition-system component. Installation should be done by a qualified pool heater technician following Pentair's service instructions. Inspect the shipment upon arrival and report damage promptly.

WARNING: This product can expose you to chemicals 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

• MiniMax NT STD heaters that light and then shut off or lock out.
• Replacing a cracked, corroded or failed flame sensor.
• Burner and ignition service on MiniMax NT 200-400 heaters.
• Pool heater service technicians.

Key Features

• Genuine Pentair OEM part, number 471603.
• Metal electrode with ceramic insulator.
• Fits MiniMax NT STD models 200, 250, 300 and 400.
• Direct replacement for the original flame sensor.

Benefits

• Restores reliable flame detection.
• Helps stop nuisance shutdowns and lockouts.
• OEM fit for a quick replacement.

Compatibility

For Pentair MiniMax NT STD heaters, models 200, 250, 300 and 400. Confirm your heater's model number and the part number in its parts list before ordering.

Installation or Upgrade Context

Turn off power and gas and let the heater cool. Disconnect the sensor lead, remove the old flame sensor from the burner tray, install the new 471603 in the same position and reconnect the lead. Restore power and gas and confirm the heater lights and stays lit.

What’s Included

• One Pentair 471603 electrode flame sensor

Specifications

Warranty

Covered by a 60-day manufacturer warranty, subject to Pentair’s applicable terms. Contact Pentair for warranty claim instructions; Pool Supply Depot can provide proof of purchase.

Customer Q&A

Which heaters does this fit?

Pentair MiniMax NT STD heaters, models 200, 250, 300 and 400.

My heater lights and then shuts off. Is it the flame sensor?

It's a common cause, but low gas pressure, poor grounding or an ignition control fault can cause the same symptom. Have a technician confirm before replacing.

Can I install it myself?

Professional installation by a qualified pool heater technician is recommended.