Utica-Dunkirk 1500009 Safety Switch

The Utica-Dunkirk 1500009 Safety Switch is a critical field-service component designed for precise blocked vent detection in heating systems. This 280f Blocked Vent Safety Swtch functions as a manual-reset limit thermostat, engineered to interrupt the burner circuit if flue temperatures exceed the safe threshold due to restricted ventilation. For a veteran technician, this is a standard safety protocol part used extensively in the Utica MGC series and compatible Dunkirk boiler configurations, safeguarding against dangerous backdrafting and heavy CO accumulation within the mechanical room.

Built with high-temperature resistance and a rugged housing, the 1500009 replacement part ensures reliable system lockout until the venting obstruction is cleared and the technician manually resets the device. This is a direct OEM-spec boiler limit switch replacement, maintaining the strict safety certifications required for residential and light commercial hydronic systems. Whether you are troubleshooting a nuisance trip or a hard failure, the Utica-Dunkirk 1500009 provides the exact thermal response curve needed to protect the heat exchanger and the building occupants from improper drafting conditions.

• Precise Thermal Call: Factory-set to open at 280°F, ensuring rapid response to blocked vent conditions.
• Manual Reset Feature: Forces a manual inspection of the flue pipe and chimney before the system can be fired, ensuring safety compliance.
• Direct OEM Compatibility: Specifically engineered for a drop-in fit for Utica-Dunkirk heating systems, including the MGC series.
• Construction Durability: Designed to withstand the high-heat environment of a boiler breach without premature fatigue or drifting.

• Why is my Utica boiler safety switch tripping frequently? Common causes include a blocked chimney, a stuck vent damper, or excessive soot buildup in the heat exchanger causing flue gases to spill.
• Can I bypass the 1500009 switch for testing? No. This is a primary safety device; bypassing it creates a high risk of carbon monoxide poisoning. Always verify vent clearance before resetting.
• Is this switch compatible with other boiler brands? While designed for Utica and Dunkirk, compatibility depends on the 280°F set point and mounting bracket. Always verify your specific model number.

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.