Pentair 42002-0024S Stack Flue Sensor - Pool Heater Part

The Pentair Stack Flue Sensor (42002-0024S) is a genuine OEM replacement designed for MasterTemp® and Max-E-Therm® pool and spa heater electrical systems. It monitors flue gas temperature and feeds that data to the heater's control board, helping ensure proper combustion control and safety shut-down if temperatures exceed safe limits. Installed on the exhaust elbow, this sensor is a common fix for heaters displaying E05 or E06 error codes. Built to withstand the thermal cycling and harsh conditions inside a heater's flue, it restores safe, reliable operation quickly.

• Genuine Pentair/Sta-Rite OEM replacement sensor
• Compatible with MasterTemp and Max-E-Therm heater electrical systems
• Monitors flue temperature to support safe combustion and automatic shut-down
• Resolves common E05/E06 stack flue error codes
• Durable construction rated for continuous thermal cycling