Description
Overview
The Armstrong Furnace R43127-001 is a genuine OEM replacement flame sensor designed to restore safe, dependable ignition performance to compatible Armstrong furnaces. The flame sensor is a critical safety component in your furnace’s ignition system — it detects the presence of a burner flame and signals the control board to keep the gas valve open. A faulty or degraded flame sensor is one of the most common causes of furnace short-cycling, nuisance lockouts, and no-heat calls, making this a go-to replacement part for HVAC technicians and homeowners alike.
Key Features
- Genuine OEM Armstrong Furnace replacement part — ensures proper fit and function
- Direct drop-in replacement for compatible Armstrong furnace models
- Restores accurate flame detection to prevent nuisance lockouts and short-cycling
- Designed to meet original equipment specifications for long-lasting reliability
- Essential safety component — shuts off gas supply when no flame is detected
Application
The R43127-001 flame sensor is intended for use in Armstrong Furnace systems that utilize a direct ignition control sequence. When the sensor’s sensing rod becomes coated with oxidation or carbon buildup over time, it loses its ability to conduct the small microamp current needed to verify flame presence, causing the furnace to shut down. Replacing the sensor with this OEM part quickly resolves the issue and returns the system to normal operation.
Installation Notes
- Always disconnect power to the furnace before servicing
- Handle the ceramic insulator carefully to avoid cracking
- Ensure the sensing rod does not contact the burner assembly or any grounded metal surface
- Verify compatibility with your specific Armstrong furnace model number before installation
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