Pentair Max-E-Therm/MasterTemp Air Flow Switch (42001-0061S) productsunlimited Helps support dependable control-to-load connection

Helps support dependable control-to-load connection

everyday spa operation can become more difficult than it should be

Replacing the main body can turn a struggling rebuild into a cleaner and much more confidence-inspiring repair

Useful when the original flapper is worn or damaged

Pentair Max-E-Therm/MasterTemp Air Flow Switch (42001-0061S) productsunlimited Helps support dependable control-to-load connectionHelp 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 sequence, 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