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
Specifications
This is a genuine Pentair/Sta-Rite replacement stack flue sensor used in the electrical systems of Max-E-Therm and MasterTemp gas pool and spa heaters. It monitors flue gas temperature and signals the heater's control board to shut down safely if temperatures exceed safe operating limits, helping restore proper combustion control after a worn or failed sensor triggers an error code.
Key Features & Performance
- Power Down First: Turn off the filter pump and all electrical power to the pool heater, and allow the heater to cool for at least 30 minutes before servicing.
- Inspect Wiring & Bracket: Check the flue sensor's wiring harness and mounting bracket for corrosion or looseness during replacement to prevent intermittent faults.
- Confirm Sensor Version: Double-check whether your heater uses the older stack flue switch or the current wire-lead sensor design before ordering, since connection styles differ.
- Seal on Install: When threading the new sensor into the exhaust elbow, seal it with a bead of RTV sealant to help ensure a proper thermal and mechanical fit.
- Verify Heater Model: Confirm your specific Max-E-Therm or MasterTemp model and production date range before purchasing, as keypad and some electrical components changed over time; professional installation is recommended.
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Pentair
Pentair 42002-0024S Stack Flue Sensor - Pool Heater Part
Pickup currently unavailable at Marathon FL
