Lochinvar & A.O. Smith 100093801 Door Assembly

As a seasoned technician, you know that maintaining the combustion chamber's integrity is non-negotiable for system safety and peak thermal output. The Lochinvar & A.O. Smith 100093801 Door Assembly is a critical OEM component designed to seal the burner access point on specific natural gas water heater and commercial boiler models. This manifold door assembly serves as the primary mounting interface for the burner tube, pilot line, and igniter, ensuring a precise fit that prevents hazardous gas leaks and maintains the necessary pressure environment for consistent ignition.

Engineering-wise, this 100093801 unit is a direct-fit replacement part built to handle the high-temperature demands of continuous cycling. It replaces legacy part numbers 6910802 and 9007538002, providing a localized seal that is vital for Flame Vapor Ignition Resistant (FVIR) compliance. When diagnosing pilot outages or burner instability, replacing a warped or corroded inner door with this genuine 100093801 burner door assembly is the professional standard for restoring factory-spec airflow and heat distribution within the combustion assembly. This part is specifically calibrated for natural gas (NG) configurations and must be matched to the unit's serial number to ensure correct orifice and pilot alignment.

• OEM-Grade Seal: Ensures airtight combustion chamber integrity to prevent CO leakage and inefficient fuel-to-air ratios.
• Durable Construction: Heavy-duty materials resist thermal expansion and warping under prolonged high-heat conditions.
• Precise Component Alignment: Pre-drilled and indexed for direct mounting of the burner tube, igniter, and flame sensor.
• System Safety: Restores original safety standards for FVIR-protected water heating equipment.
• Broad Compatibility: Engineered for a wide range of Lochinvar, A.O. Smith, and American Water Heater high-efficiency units.

Does this assembly include the manifold door gasket?
Most technician-level kits for the 100093801 include the primary door plate and mounting hardware, but if the original high-temp gasket is brittle or torn, it should be replaced concurrently to ensure a 100% seal.

Can I use this door assembly for Liquid Propane (LP) units?
No, this specific part number is engineered for Natural Gas (NG) applications. Using it with LP requires a different orifice and pilot configuration; always verify your fuel type before installation.

Why is this part specific to the serial number?
Manufacturers often update burner designs within the same model series. To ensure the pilot tube and manifold line align perfectly with the gas valve outlets, cross-referencing your serial number is mandatory.

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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.