Robertshaw 41-402 Hot Surface Ignitor

The Robertshaw 41-402 Hot Surface Ignitor is a direct-replacement Norton 271W series silicon carbide igniter engineered for high-performance gas-fired equipment. This 120V ignition component features a spiral-type heating element designed for rapid heat-up times and consistent amperage draw, ensuring reliable ignition cycles in both residential and commercial furnaces and boilers. The 41-402 Robertshaw ignitor is built with high-density recrystallized silicon carbide, providing mechanical strength and thermal shock resistance during frequent cycling. This model comes equipped with 19-inch 18-gauge nickel chrome lead wires insulated with fiberglass for high-temperature durability, terminating in a standard molex-style plug for quick field installation. When troubleshooting a hot surface ignitor failure, verifying the 40-75 ohm resistance range at room temperature is essential for diagnostics. This igniter is a common replacement part for numerous OEM applications, including units from York, Armstrong, and Luxaire, offering a precise fit and OEM-grade performance for HVAC technicians.

• Universal Compatibility: Serves as a direct cross-reference for the Norton 271W and various OEM hot surface igniter replacements.
• Enhanced Durability: Constructed with premium silicon carbide to withstand high-temperature oxidation and maintain consistent ignitor resistance levels.
• Simplified Installation: Features a 19-inch lead length and pre-stripped ends or plug-in connectors to reduce time on the job site.
• Reliable Cold Starts: Engineered for optimal thermal conductivity, reaching ignition temperatures quickly to prevent gas valve timeout errors.

How do I test if the Robertshaw 41-402 is defective?
Using a multimeter, check the resistance across the lead wires. A functional 41-402 ignitor typically reads between 40 and 75 ohms. If the circuit is open or resistance is excessively high, the silicon carbide element is likely cracked or pitted.

Can I touch the igniter element during installation?
No. Avoid touching the black carbide element with bare hands. Skin oils create hot spots that lead to premature failure. If contact occurs, clean the element carefully with denatured alcohol before firing the unit.

What causes these igniters to fail prematurely?
Common causes include over-voltage from the control board, physical vibration, or contamination from dust and oils. Always ensure the burner transition is smooth to prevent localized overheating of the igniter tip.

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.