Weil McLain 510-300-013 Spill Switch

The Weil McLain 510-300-013 Spill Switch is a critical safety component designed specifically for certain Weil McLain gas-fired boilers, including the CG, CGA, EG, and PFG series. This premium safety limit is engineered to detect flue gas spillage caused by chimney blockages or improper venting. The unit features an integrated manual reset (M/R) button, ensuring that your heating system cannot resume operation until a qualified technician investigates and resolves the underlying venting problem. Unlike automatic switches, this manual reset spill switch prevents the boiler from cycling under dangerous conditions, effectively mitigating the risk of carbon monoxide infiltration.

Operating with a precise 210°F temperature rating, this switch acts as a failsafe when high-temperature flue gases exceed the safe limit at the draft hood. It is an authentic Weil McLain OEM replacement part, ensuring standardized fitment and compliance with the original equipment design for the CG-25 and larger residential boiler configurations. As a normally closed safety circuit component, it maintains constant continuity under standard operating conditions and opens the circuit instantly upon reaching its specialized thermal trip point. Durable construction and a factory-calibrated sensor provide the reliability required for multi-season performance in high-demand hydronic systems.

Key Benefits

• Safety Interlock: High-accuracy 210 degree Fahrenheit trip point ensures rapid system shutdown during flue gas spillage events.
• Manual Reset Feature: Prevents automatic restart to ensure the venting obstruction or backdraft issue is addressed by a professional.
• Broad Compatibility: Genuine replacement for Weil McLain CG, CGA, and EG boilers, including sizes 30 through 55.
• OEM Reliability: Direct manufacturer replacement (Part Number 510-300-013) designed specifically for spark ignition gas boilers.
• Easy Mounting: Pre-drilled for standard draft hood installation, simplifying field service and replacement for contractors.

Common Questions

What causes a spill switch to trip on a Weil McLain boiler?
Tripping is typically caused by a restricted chimney, a birds nest in the vent, snow covering the flue outlet, or a lack of adequate combustion air in the mechanical room.

Is the 510-300-013 interchangeable with other spill switches?
While physical dimensions may match, you must use the specific 210F rated switch designated for your model. Using a higher or lower temperature rating can result in nuisance trips or dangerous delayed shutdowns.

How do I test if the spill switch is defective?
A veteran technician should use a multi-meter to check for continuity across the terminals. If the switch is open at room temperature and refuses to reset via the manual button, it needs replacement.

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.