Lochinvar & A.O. Smith 100110589 Pressure Switch

The Lochinvar & A.O. Smith 100110589 Pressure Switch is a critical safety component designed for high-efficiency boilers and water heaters. As a genuine OEM replacement part, this switch ensures the combustion air pressure and venting conditions meet precise operational parameters before allowing the ignition sequence to proceed. It effectively monitors the inducer draft, preventing the system from firing under hazardous conditions such as blocked flues or failed fan motors. This HVAC pressure control is engineered for industrial control and automation applications, offering the durability required for both heavy-duty commercial and residential heating systems.

For technicians in the field, the 100110589 serves as a direct boiler pressure switch replacement for obsolete or failing units, including the A.O. Smith 9005681205. Its rigid construction and fine-tuned set points maintain HVAC system performance while reducing the risk of overheating or inefficient fuel consumption. When troubleshooting ignition failure codes or short cycling, this switch is a primary diagnostic point to verify the integrity of the pressure circuit and vent safety. Integrating this authentic component ensures seamless compatibility with standard electrical systems and maintains the operational consistency demanded by modern HVACR equipment.

• Precise Pressure Regulation: Monitors air pressure to ensure the burner only activates when safe draft levels are reached.
• OEM Compatibility: Replaces factory parts for Lochinvar Knight and A.O. Smith power vent models without modification.
• Enhanced System Reliability: Durable diaphragm and terminal construction reduce electrical resistance and prevent false system lockouts.
• Safety Monitoring: Prevents the accumulation of combustion gases by detecting blocked flue or inlet conditions.
• Broad Application: Suitable for a wide range of water heaters and boilers in both residential and industrial environments.

• How do I know if the 100110589 pressure switch is failing? Common symptoms include the inducer running without ignition, the igniter glowing briefly then shutting off, or the control board displaying three flashes for a "failed open" switch.
• Is this switch compatible with A.O. Smith GPVH models? Yes, it is frequently used in A.O. Smith and Lochinvar power-vented units. Always check your specific model number for a match.
• What causes these switches to trip frequently? Beyond a faulty switch, common issues include condensate buildup in the sensing tube, a restricted vent pipe, or a weakening inducer motor.

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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.