Pentair Max-E-Therm/MasterTemp Air Flow Switch (42001-0061S)

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Help the heater verify proper airflow before ignition with this air flow switch for compatible Max-E-Therm and MasterTemp systems. The switch is part of the safety and control sequ ence, confirming that the combustion air system is operating before the heater continues through startup.A failing air flow switch may contribute to ignition problems, shutdowns, or diagnostic issues when the blower and venting system are otherwise serviceable. This replacement should be installed as part of a careful troubleshooting process. Air flow safety switch for compatible heaters Supports proper startup verification Helps diagnose airflow-related heater faults Fits select Max-E-Therm and MasterTemp applications Professional heater service is recommended Show more