Replacing a weak capacitor is standard preventative maintenance to prevent motor winding damage

Working in the field

We do not recommend it

serving as a direct solution for ignition failures or intermittent "lockout" codes caused by carbon buildup or porcelain cracks

warping from over-torquing

Resideo Q4100C9046 Hot Surface Ignitor Replacing a weak capacitor isHandle your next service call with the Resideo Q4100C9046, a field proven 120V silicon carbide hot surface igniter designed for maximum durability in gas fired furnaces and boilers. This high temp HSI replacement features a robust ceramic block rated for 392F (200C), ensuring stable performance in both natural gas and liquid propane (LP) applications. The 19 1 8" lead length provides ample slack for complex cabinet routing, while the stripped end