York S1-025-27773-700 Flame Sensor

The York S1-025-27773-700 Flame Sensor is a critical OEM component designed for precise flame rectification in high-efficiency York gas furnaces and HVAC units. Engineered to interface with the integrated furnace control board, this rod utilizes a microamp signal to confirm the presence of a pilot or burner flame, preventing hazardous unburned gas buildup and nuisance lockout codes. This sensor features a high-grade Kanthal alloy probe to withstand consistent cycles of high-temperature exposure while maintaining signal integrity. It is a direct replacement for various Johnson Controls and Source 1 equipment models, ensuring optimal rectification circuit performance. For field technicians, verifying the flame sensor microamp reading is essential; if the signal drops below 1.0 μA, replacing the existing rod with this OEM S1-025-27773-700 restores reliable ignition sequence timing. Ensure the ceramic insulator is intact during installation to prevent grounding issues that lead to intermittent furnace short cycling.

• OEM Compatibility: Precision-fit for York, Luxaire, and Coleman gas-fired equipment, eliminating mounting bracket alignment issues.
• High-Temperature Durability: Constructed from ceramic and specialized alloy to resist oxidation and carbon buildup under extreme BTU loads.
• Reliable Signal Continuity: Maintains a stable DC microamp signal to the ignition control module for consistent burner operation.
• Direct Plug-and-Play: Features a standard 1/4-inch male spade electrical terminal for quick connection to the existing wiring harness.

What is the typical microamp reading for this York flame sensor?
When functioning correctly, this sensor should produce a steady DC signal between 1.5 to 5.0 microamps, depending on the furnace control board specifications.

Can I clean this sensor with sandpaper to restore the signal?
While fine steel wool or an abrasive pad can temporarily remove oxidation, the York S1-025-27773-700 should be replaced if the ceramic is cracked or the metal is severely pitted to ensure long-term reliability.

Does this sensor resolve furnace error code 7 or 8?
Yes, those codes often indicate a flame sense failure. Installing a new OEM flame rod is the standard procedure for resolving intermittent flame signal loss.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.