Ao Smith 100113144 Blower Prover Switch

Product Description

The AO SMITH 100113144 is a blower prover switch designed as a direct replacement component for water heater and HVAC systems that use draft-inducer or combustion-air blower assemblies. This pressure-sensing switch verifies that the blower motor is operating and producing adequate airflow before allowing the ignition sequence to proceed. It functions as a safety interlock within the control circuit, preventing ignition in the absence of confirmed airflow. Licensed HVAC technicians and water heater service professionals install this part during routine maintenance or when a system is lockout-faulting due to a failed or out-of-spec prover switch.

Blower prover switches are installed in residential and light commercial gas-fired appliances equipped with powered-venting or induced-draft systems. This switch is appropriate for service calls where the existing switch has failed open, failed closed, or where the diaphragm has deteriorated and no longer responds accurately to the pressure differential generated by the blower. Verify the pressure rating and port configuration of the original switch before installation.

Key Features

• Functions as a safety interlock to confirm blower airflow before ignition
• Direct replacement design for serviceability without system modification
• Pressure-differential sensing mechanism for reliable draft verification
• Compatible with induced-draft and powered-vent appliance configurations

Compatibility

Designed as an OEM-style replacement blower prover switch for AO SMITH gas-fired water heaters and appliances equipped with induced-draft blower assemblies. Confirm the original part number and pressure rating before installation.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified water heater service professional. Shut off gas supply and disconnect power to the appliance before beginning any service work. Inspect the rubber tubing connecting the switch to the blower housing for cracks or blockages, as a damaged hose can cause the new switch to fault immediately after installation. Follow all applicable local codes and the appliance manufacturer service documentation during replacement.

Technical Specifications

• Type: Replacement Part

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100113144