Pentair MasterTemp Pool Heater Air Flow Switch | 42001-0061S
Pentair
SKU: 42001-0061S
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
- Heater will not ignite: Check that the blower is running and that the vacuum tubing is not kinked or blocked.
- Intermittent operation: Inspect tubing for leaks, confirm mounting alignment, and check blower airflow path.
- 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.
Questions about returns? View our return policy.
Hours Of Operation:
Monday - Friday: 7:00 am to 5:00 pm Phoenix Time
Saturday: 8:00 am to 2:00 pm
Sunday: Closed
- We do not ship on Saturday or Sunday.
- Orders totaling more than $300 will require signature confirmation upon delivery.
- We process and prepare orders for shipment within 1 business day. Please note that many other pool supply retailers require 3–5 days of handling time before shipping.
- Orders placed after 1:00 pm Phoenix Time may not be eligible for same-day shipment.
- Expedited shipping options are available at checkout.
Return Policy:
- Products that are received damaged will receive a refund in store credit.
- Most products are eligible for return within 30 days of receipt, except where noted below.
- To initiate a return, please complete an RMA form prior to sending your item back.
- Original shipping costs are non-refundable and will be deducted from the return credit.
- Items returned missing accessories or original packaging, or that are not in the same condition as received, may be subject to a restocking fee of up to 100% depending on the condition of the item upon return.
- Some returns will be charged an automatic 15% restocking fee.
- We are unable to issue refunds for items that have been damaged or rendered inoperable due to installer error.
- Please complete the return form to receive your RMA number and return shipping label.
- Chemical products are not eligible for return under any circumstances.
- The Pentair Colorsync 618031 is not eligible for return.
- Pool cleaners are not eligible for return.
- Opened seals and o-rings are not eligible for return.
- Capacitors are not eligible for return.
- Plastic popup tools are not eligible for return.
- Automation components and circuit boards are not eligible for return.
- If a light is returned due to a reported malfunction and is found to be fully operational upon testing, return shipping costs and a restocking fee will be deducted from the refund.
- Orders refused at the time of delivery will be subject to the original shipping costs being deducted from the refund.
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