P323664 250°F M/R Furnace Vent Safety Switch - Replacement for Williams 5001521A 5001522A 6501521A 650122A

This 250°F manual reset (M/R) vent safety switch is a precise substitute for Williams Comfort Products part numbers 5001521A, 5001522A, 6501521A, and 650122A. As a core overheat protection component, it cuts off the furnace power at 250°F to prevent vent system overheating and fire risks, requiring manual reset to resume operation for added safety control. Tailored to fit for Williams furnace models that use the target replacement parts, the switch matches the original’s electrical ratings and physical dimensions exactly. It integrates seamlessly into your furnace’s vent safety system without extra adapters, modifications, or professional calibration. Equipped with a high-sensitivity temperature-sensing mechanism, the switch triggers an immediate system shutdown when vent temperatures reach the 250°F threshold. The manual reset design ensures you can inspect the furnace for potential issues before restarting, avoiding unsafe automatic operation after overheat events. Built with premium temperature-resistant materials and a rugged housing, this vent safety switch withstands the high-heat, corrosive vent exhaust environment . Its durable build resists wear and damage from continuous exposure to hot air, minimizing replacement frequency and extending service life. Designed for straightforward drop-in installation with a standard mounting design, the switch requires no specialized HVAC skills to install. Just disconnect the wires from your old switch (take a photo for reference), remove the mounting screws, swap in the new P323664, and reconnect the wires correctly—your furnace’s vent safety function will be restored in minutes.

• This 250°F manual reset (M/R) vent safety switch is a precise substitute for Williams Comfort Products part numbers 5001521A, 5001522A, 6501521A, and 650122A. As a core overheat protection component, it cuts off the furnace power at 250°F to prevent vent system overheating and fire risks, requiring manual reset to resume operation for added safety control.
• Tailored to fit for Williams furnace models that use the target replacement parts, the switch matches the original’s electrical ratings and physical dimensions exactly. It integrates seamlessly into your furnace’s vent safety system without extra adapters, modifications, or professional calibration.
• Equipped with a high-sensitivity temperature-sensing mechanism, the switch triggers an immediate system shutdown when vent temperatures reach the 250°F threshold. The manual reset design ensures you can inspect the furnace for potential issues before restarting, avoiding unsafe automatic operation after overheat events.
• Built with premium temperature-resistant materials and a rugged housing, this vent safety switch withstands the high-heat, corrosive vent exhaust environment . Its durable build resists wear and damage from continuous exposure to hot air, minimizing replacement frequency and extending service life.
• Designed for straightforward drop-in installation with a standard mounting design, the switch requires no specialized HVAC skills to install. Just disconnect the wires from your old switch (take a photo for reference), remove the mounting screws, swap in the new P323664, and reconnect the wires correctly—your furnace’s vent safety function will be restored in minutes.