If the pilot assembly orifice of a spark ignition furnace is completely clogged, what should be done?

The best course of action for a completely clogged pilot assembly orifice in a spark ignition furnace is to replace it. A pilot assembly orifice is critical for regulating the flow of gas to the pilot light, ensuring it consistently ignites. If the orifice is completely clogged, cleaning methods may not restore it to full functionality. Over time, debris and buildup can permanently alter the orifice, leading to improper gas flow and potentially unsafe operating conditions.

Replacing the orifice ensures that the furnace operates safely and efficiently, as it provides a proper and reliable gas passage for ignition. In contrast, other options involve methods that could potentially provide only a temporary fix; for instance, cleaning attempts using tools or chemicals may risk damaging the orifice further or fail to fully eliminate the clog. Therefore, replacement is the most effective and safe solution.