Pentair 42001-0061S – Air Flow Switch
Product Overview
The 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.
Key Features
- OEM replacement air flow switch for select Pentair and Sta-Rite heaters.
- Monitors blower air pressure and ensures proper airflow before ignition.
- Essential safety component that prevents heater ignition when airflow is inadequate.
- Direct-fit replacement requiring no modification when installed on compatible models.
Technical Specifications
- Part Number: 42001-0061S
- Type: Air flow / vacuum safety switch
- Voltage: Low-voltage heater control circuit
- Application: Combustion air verification in pool and spa heaters
Compatible Heater Models
- Pentair MasterTemp heaters
- Sta-Rite Max-E-Therm heaters
- Other compatible Pentair/Sta-Rite models using the same air flow sensing design
Applications & Purpose
This 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.
Installation Instructions
- Turn off power and gas supply to the heater.
- Remove the access panel and locate the existing air flow switch on the blower housing.
- Disconnect wires and vacuum tubing from the old switch.
- Install the new 42001-0061S switch in the same position and reconnect wiring and tubing.
- Restore power and gas, then run a startup cycle to verify proper heater operation.
Troubleshooting
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Heater will not ignite: Check that the blower is running and that the vacuum tubing is not kinked or blocked.
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Intermittent operation: Inspect tubing for leaks, confirm mounting alignment, and check blower airflow path.
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Air flow switch stuck open or closed: Replace the switch if contacts fail to change state during blower operation.
Maintenance Tip
Inspect 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.
