Pentair MasterTemp Pool Heater Stack Flue Sensor | 42002-0024S
Pentair
SKU: PEN420020024S
Pentair 42002-0024S Stack Flue Sensor
Part # 42002-0024S — the replacement stack/flue temperature sensor designed for use in select Pentair and Sta-Rite pool/spa gas heaters. This sensor monitors flue-gas temperature to ensure safe and proper combustion performance.
Key Features
- Designed specifically for gas-fired pool and spa heaters requiring a stack/flue sensor.
- Detects excessive flue-gas temperature or blocked flue conditions and signals the control system accordingly.
- OEM part that assures compatibility and reliability with the original heater model’s control electronics.
- Compact threaded design for drop-in replacement of the original sensor in the flue pipe or exhaust stack.
- Essential for avoiding error codes related to flue sensor faults and maintaining heater safety compliance.
Typical Applications
This sensor is used when the heater displays stack/flue sensor fault codes (such as E05 or E06) or when the original sensor has failed, corroded, or is out of spec. It is commonly installed in Pentair and Sta-Rite gas heaters to restore safe operation and proper exhaust monitoring.
Installation & Compatibility Notes
Before installing, turn off electrical power and gas supply to the heater and allow it to cool. Remove the heater flue cover or access panel, locate the existing stack/flue sensor, disconnect wiring, and unthread the old sensor. Thread in the new 42002-0024S sensor snugly (do not overtighten), reconnect the wiring in the same orientation, restore power and gas, and restart the unit. Monitor the heater through a full start-up to verify normal operation and no fault codes are present.
Why Choose This Sensor?
Selecting the correct OEM sensor like the 42002-0024S provides confidence in fitment, performance and heater safety. Generic or mismatched sensors may result in improper readings, recurrence of fault codes, or reduced heater lifespan. For pool professionals and service techs, this part ensures the heater operates within its designed limits.
Maintenance Tips
- Inspect the sensor and its mounting area annually for corrosion, soot accumulation or thermal damage.
- Check wiring connections for secure fit, insulation damage, or discoloration—loose or damaged wires often cause fault codes.
- Ensure the flue/exhaust piping is clear of obstructions or corrosion—sensor faults may be caused by blocked or damaged exhaust flow.
- When replacing the sensor as part of heater service, consider logging the heater runtime and verifying the flue-gas temperature is within specifications post-service.
Hours Of Operation:
Monday - Friday: 8:00 am to 4:00 pm Phoenix Time
Saturday and Sunday: Closed
- Orders costing more than $300 WILL be required to have signature confirmation upon delivery.
- Handling time is typically only 1 day.
- Any item ordered after 1pm Phoenix time, may not ship same-day.
- Call us if you require expedited shipping and we can give you quotes based on your needs.
Return Policy:
- All products, except as noted below, are eligible for return up to 30 days after receipt of item.
- For returns, an RMA form must be filled out HERE or customers can call for additional help.
- Shipping costs will be deducted from all returned items.
- Any item that is missing accessories, original packaging, or is not returned in the same condition that it was received in, may be subject to a re-stocking fee up to 100% based on the condition we receive it in.
- Items broken, damaged, or inoperable due to installer error will not be refunded.
- Fill out the return form or give us a call to obtain an RMA and return shipping label.
- There are no returns on the Pentair Colorsync 618031
- No returns on pool cleaners.
- No returns on opened seals and o-rings.
- No returns on capacitors.
- If a light is returned because it "doesn't work" and it tests fine, the cost to ship and a re-stocking fee will be deducted from the refund.
- All products denied upon arrival at customers house WILL be charged the cost to ship.
- Visa Gift Card Promotions: Gift cards are sent within 14 days of the order. When accepting the Visa Gift card, you agree that if your order is returned or refunded, this amount will be deducted from the refunded amount. All Visa Gift cards are sent via email in an E-Gift Card format and are non refundable.
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