{"product_id":"pentairmastertemppoolheaterairflowswitch420010061spen420010061s","title":"Pentair MasterTemp Pool Heater Air Flow Switch | 42001-0061S","description":"\u003cdiv\u003e\n\u003ch2\u003ePentair 42001-0061S – Air Flow Switch\u003c\/h2\u003e\n\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThe Pentair 42001-0061S is an OEM air flow (vacuum) switch used in Pentair and Sta-Rite heaters to verify proper airflow before ignition. It ensures the combustion blower is operating correctly, allowing the heater to start safely and preventing ignition faults caused by insufficient airflow.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eOEM replacement air flow switch for select Pentair and Sta-Rite heaters.\u003c\/li\u003e\n\u003cli\u003eMonitors blower air pressure and ensures proper airflow before ignition.\u003c\/li\u003e\n\u003cli\u003eEssential safety component that prevents heater ignition when airflow is inadequate.\u003c\/li\u003e\n\u003cli\u003eDirect-fit replacement requiring no modification when installed on compatible models.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePart Number: 42001-0061S\u003c\/li\u003e\n\u003cli\u003eType: Air flow \/ vacuum safety switch\u003c\/li\u003e\n\u003cli\u003eVoltage: Low-voltage heater control circuit\u003c\/li\u003e\n\u003cli\u003eApplication: Combustion air verification in pool and spa heaters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatible Heater Models\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePentair MasterTemp heaters\u003c\/li\u003e\n\u003cli\u003eSta-Rite Max-E-Therm heaters\u003c\/li\u003e\n\u003cli\u003eOther compatible Pentair\/Sta-Rite models using the same air flow sensing design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications \u0026amp; Purpose\u003c\/h3\u003e\n\u003cp\u003eThis switch ensures the heater will not ignite unless the blower is providing adequate airflow. A worn or faulty air flow switch can cause ignition lockouts, intermittent heating, or failure to start.\u003c\/p\u003e\n\u003ch3\u003eInstallation Instructions\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTurn off power and gas supply to the heater.\u003c\/li\u003e\n\u003cli\u003eRemove the access panel and locate the existing air flow switch on the blower housing.\u003c\/li\u003e\n\u003cli\u003eDisconnect wires and vacuum tubing from the old switch.\u003c\/li\u003e\n\u003cli\u003eInstall the new 42001-0061S switch in the same position and reconnect wiring and tubing.\u003c\/li\u003e\n\u003cli\u003eRestore power and gas, then run a startup cycle to verify proper heater operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTroubleshooting\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeater will not ignite:\u003c\/strong\u003e Check that the blower is running and that the vacuum tubing is not kinked or blocked.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntermittent operation:\u003c\/strong\u003e Inspect tubing for leaks, confirm mounting alignment, and check blower airflow path.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir flow switch stuck open or closed:\u003c\/strong\u003e Replace the switch if contacts fail to change state during blower operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMaintenance Tip\u003c\/h3\u003e\n\u003cp\u003eInspect the air flow switch and vacuum tubing annually. Ensure tubing is clean, flexible, and free of obstructions. Replace the switch if it shows signs of wear, sticking, or inconsistent operation to maintain safe heater performance.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Pentair","offers":[{"title":"Default Title","offer_id":46797815546031,"sku":"42001-0061S","price":109.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0734\/6415\/2239\/files\/pentair-mastertemp-pool-heater-air-flow-switch-42001-0061s-heater-parts-6974333.jpg?v=1777067693","url":"https:\/\/freshized.com\/products\/pentairmastertemppoolheaterairflowswitch420010061spen420010061s","provider":"Freshized","version":"1.0","type":"link"}