Pentair ETI400 Stack Flue Sensor Replacement Kit | 475601
Pentair
SKU: 475601Z
Pentair ETI400 Stack Flue Sensor Replacement Kit | 475601
The Pentair ETI400 Stack Flue Sensor Replacement Kit (475601) is a genuine replacement sensor assembly designed for the Pentair ETI400 Series Condensing Gas Heater. The stack flue sensor monitors exhaust temperature and combustion conditions, helping the heater’s control system maintain safe, efficient operation and protect internal components.
What This Part Is For
This replacement sensor is specifically made for the Pentair ETI400 Condensing Gas Heater. Replace it when the original flue sensor fails, reads out of range, or triggers error codes—issues that can lead to inefficient combustion, shutdowns, or false safety trips.
Features & Benefits
- OEM replacement stack flue temperature sensor for ETI400 heaters
- Helps maintain efficient and safe combustion performance
- Prevents false shutdowns or error conditions due to bad sensor readings
- Durable design for long-term service in heater environments
Installation Notes
- Turn off power and gas supply before servicing
- Remove the old sensor and install the replacement in the same position
- Ensure connectors and wiring are secure to prevent poor readings
- Test heater operation after replacement to confirm proper function
Maintenance Tips
- Inspect the sensor wiring and connector during routine service
- Clean surrounding flue areas if soot or buildup is present
- Replace at the first sign of erratic temperature readings or service codes
Related Products
- Pentair ETI400 Condensing Gas Heater – The main heater model that this sensor kit supports.
- Pentair ETI400 Service Kit – General maintenance kit with common service parts for the ETI400 heater.
- Pentair ETI400 Condensate Neutralizer Replacement Kit – Kit to neutralize acidic condensate and protect drain lines.
- Pentair ETI400 Indoor Direct Air Intake Kit – Accessory kit for indoor installations requiring dedicated airflow.
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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