Weil McLain 383-500-605 Maintenance Kit

The Weil-McLain 383-500-605 Maintenance Kit is a comprehensive OEM service package designed specifically for Ultra Series 80 and 105 Gas Boilers. As a technician, you know that annual preventive maintenance is non-negotiable for high-efficiency condensing units to prevent common ignition failures and combustion instability. This kit includes the critical hot surface igniter, which effectively doubles as the flame sensor for rectification. Replacing the igniter and the igniter gasket ensures reliable light-off and prevents control module lockouts. The 383-500-605 also provides the burner gasket, cover plate gasket, venturi gasket, and cover plate insulation to maintain an airtight seal within the combustion chamber, preventing dangerous flue gas leakage and optimizing fuel-to-air ratios. Utilizing these factory-specified components during a teardown is essential to clear out combustion byproducts and ensure the Ultra 80 or 105 operates at peak thermal efficiency throughout the heating season.

Key Benefits:

• Includes a 120V OEM igniter assembly to resolve flame rectification issues and intermittent ignition faults.
• Features high-temperature gaskets (burner, venturi, and cover plate) to ensure positive seals against flue gas bypass.
• Provides cover plate insulation to protect external boiler components from radiant heat damage.
• Directly compatible with Weil-McLain Ultra Series 80 and Ultra Series 105 model boilers.
• Consolidates all essential soft parts into a single SKU for simplified boiler seasonal service and maintenance.

Common Questions:

Why should I replace the igniter if it is still glowing?
In Ultra Gas Boilers, the igniter also functions as the flame sensor. Over time, carbon buildup and material degradation increase electrical resistance, leading to weak flame rectification signals and nuisance lockouts even if ignition still occurs.

Does this kit include a heat exchanger cleaning tool?
No, the 383-500-605 kit focuses on gaskets and ignition components. A separate heat exchanger cleaning tool (Weil-McLain part 511-706-200) is typically required to properly clear the pins during annual boiler maintenance.

Can I use this kit for an Ultra 155 or 230 model?
No, this kit is sized specifically for the Ultra 80 and 105. For larger units like the Ultra 155 through 399, you must use the 383-500-620 maintenance kit to ensure proper component sizing and fit.

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.