Lochinvar & A.O. Smith 100110858 Harness

The Lochinvar & A.O. Smith 100110858 Natural Gas Valve Harness is a critical electrical interface designed for high-efficiency boiler and water heater systems. As a direct OEM replacement for part number 9006056215, this assembly ensures consistent communication between the appliance control board and the natural gas valve. For technicians troubleshooting ignition failures or intermittent "no heat" calls, this harness eliminates high-resistance connections and signal dropouts that often lead to nuisance lockouts. Constructed with high-grade, heat-resistant insulation, the 100110858 wiring harness maintains circuit integrity within the demanding thermal environment of a combustion chamber. It features precision-molded connectors that ensure a secure, vibration-resistant fit, preventing the common voltage drops that can mimic a faulty gas valve or a failing integrated control module. By utilizing this genuine HVAC replacement part, contractors can ensure the system meets original manufacturer specifications for fuel regulation and sequence of operation, reducing callbacks and maintaining peak combustion efficiency in Lochinvar and A.O. Smith equipment.

• Direct OEM Compatibility: Engineered specifically for Lochinvar and A.O. Smith units to ensure exact fitment and proper electrical impedance.
• Enhanced Signal Integrity: Minimizes electrical noise and resistance, ensuring the 24V signal from the control board reaches the gas valve solenoid without interruption.
• Durable Construction: Heavy-duty wiring and jackets designed to withstand the high-ambient temperatures found in condensing boiler cabinets.
• Simplified Troubleshooting: Replaces worn, frayed, or oxidized wiring, helping to isolate and resolve ignition sequence errors effectively.

How do I know if the harness is the cause of my gas valve not opening?
If you measure 24V at the control board terminals but not at the gas valve during the ignition trial, the harness or its connections are likely compromised. Check for frayed wires or loose pins within the connector housing.

Can this harness be used on LP (Propane) conversion units?
Yes, as long as the base model is compatible with the 100110858 part number. The harness carries the electrical signal to the valve regardless of the fuel type being regulated.

What is the primary indicator that this wiring needs replacement?
Technicians should look for visible heat damage near the terminals, corrosion on the pins, or continuity tests that show intermittent opens when the harness is flexed.

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.