Lochinvar L100275527 Flue Sensor with Grommet

Product Description

The LOCHINVAR L100275527 is a flue sensor with grommet designed for use in Noble series water heaters and boilers. This sensor monitors flue gas temperature within the exhaust pathway, providing the control system with data needed to manage combustion safety and equipment protection. A grommet is included to seal the sensor penetration point, preventing flue gas bypass and maintaining proper draft conditions. Licensed plumbers, HVAC technicians, and hydronic heating contractors typically handle this component during scheduled maintenance or fault-code diagnostics.

The L100275527 is intended for Lochinvar Noble series residential and light-commercial water heating equipment. It installs in the flue or exhaust collar of the appliance, where it feeds temperature readings to the onboard control board. This part is a direct OEM replacement for failed or out-of-specification flue sensors in Noble series units. Technicians replacing a flue sensor as part of a no-heat or overheat fault diagnosis will find this part appropriate for that application.

Key Features

• OEM flue temperature sensor engineered for Lochinvar Noble series appliances
• Includes pre-fitted grommet for sealed sensor installation at the flue penetration point
• Supports control board monitoring of exhaust temperature for combustion safety
• Direct replacement component minimizes diagnostic and installation time in the field

Compatibility

Designed as an OEM-style replacement flue sensor for Lochinvar Noble series water heating and boiler equipment.

Installation Notes

Installation should be performed by a licensed plumber or HVAC technician familiar with gas-fired water heaters and boilers. Shut down the appliance and allow the flue and heat exchanger to cool completely before removing the existing sensor. Ensure the grommet seats fully in the flue collar to prevent flue gas leakage. Verify proper sensor function through the control board diagnostic sequence before returning the unit to service.

Technical Specifications

• Includes: Grommet
• Application: Noble Series Flue Temperature Sensing

Standard Information

• Brand: LOCHINVAR
• Manufacturer Part Number: L100275527