Reznor 257665 Ignition Cable

The Reznor 257665 Ignition Cable is a critical 18-inch high-tension lead designed for reliable spark delivery in gas-fired unit heaters. Engineered for high-temperature environments, this HVAC ignition wire features heavy-duty insulation to prevent voltage leakage and electromagnetic interference (EMI) that can disrupt flame rectification signals. As a direct Reznor replacement part, it ensures precise fitment and continuity between the ignition controller and the electrode assembly. Whether performing a seasonal tune-up or troubleshooting a furnace ignition failure, replacing brittle or carbon-tracked cables is essential for maintaining consistent burner ignition and preventing nuisance lockouts. This 18-inch ignition cable is compatible with a wide range of Reznor UDAP, UDX, APD, and UDAS series units. Contractors should verify cable routing to avoid contact with sharp metal edges or high-heat surfaces, ensuring the electronic ignition lead maintains its dielectric strength throughout the heating season.

• High-Dielectric Insulation: Engineered to withstand high-voltage spikes without breakdown, ensuring a consistent spark at the burner.
• OEM Compatibility: Precision-engineered for Reznor unit heater repair, eliminating the need for field-modified universal leads.
• Corrosion-Resistant Terminals: Features robust connectors that resist oxidation, maintaining low resistance for optimal spark igniter performance.
• Thermal Stability: Rated for elevated ambient temperatures common inside the burner vestibule of commercial gas heaters.

Will this cable resolve a 'no spark' condition in Reznor heaters?
If the ignition control is sending voltage but the spark is weak or absent, a cracked or shorted ignition lead is a likely culprit. Inspect for visible cracks or arc marks.

Is the length of the Reznor 257665 critical?
Yes, this 18-inch spark plug wire provides the necessary slack for proper routing away from the manifold, preventing heat damage and interference with the flame sensor circuit.

Can this cable be used with both DSI and spark-to-pilot systems?
This cable is primarily designed for Direct Spark Ignition (DSI) systems utilized in modern Reznor unit heaters requiring a high-tension connection from the control board to the electrode.

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.