Description
The S1‑025‑27773-700 is a flame sensor designed for gas furnaces and HVAC heating systems from York (and compatible brands like Luxaire / Coleman / related units). It monitors the presence of a burner flame to ensure safe ignition and combustion. When the burner ignites, the flame sensor detects that flame and signals the control board that ignition was successful. If the flame goes out or fails to ignite properly, the sensor prompts the system to shut off the gas valve — preventing unburned gas from accumulating and reducing the risk of unsafe combustion.
Key Features
- Functionality: Detects presence of burner flame — ensures that gas has ignited properly and remains lit; if flame fails, it triggers shutdown for safety.
- Compatibility: Designed for York / Luxaire / Coleman and other compatible gas furnaces that originally used this or equivalent flame sensor part numbers.
- Rod / Sensor Dimensions (typical): Roughly a 4‑inch total length (from mounting flange to tip); sensing rod part protrudes about 2.5–2.75 inches (depending on manufacturer spec) — check your furnace model to confirm fit.
- Installation: Straight flame‑sense rod type with standard quick‑connect terminal (commonly 1/4" or 3/16" male quick‑connect, depending on furnace wiring) for direct replacement.
- Safety Role: Critical safety component — without a working flame sensor, the furnace cannot reliably verify combustion; replacing a faulty sensor helps avoid “no‑heat,” repeated flame‑out, or unsafe gas buildup scenarios.
