Ao Smith 100111914 Pressure Switch GAHH-40 GAHH-50

Product Description

The AO SMITH 100111914 is a replacement pressure switch designed for use in AO SMITH water heater systems. Pressure switches monitor system pressure conditions and send a signal to the control circuit to confirm safe operating status before allowing ignition or continued burner operation. This part is a direct OEM-style replacement, ensuring proper fit and function without modification. Licensed plumbers and HVAC technicians performing water heater service or repair are the primary installers of this component.

This pressure switch is specified for use with AO SMITH GAHH-40 and GAHH-50 model water heaters. These are gas-fired residential water heater units, and this switch is a key safety and control component within their venting or combustion air proving circuit. Replacement is typically required when the switch fails to close under normal operating conditions, causing ignition lockout or fault codes on the control board.

Key Features

• Direct replacement part for AO SMITH GAHH-40 and GAHH-50 water heaters
• Functions as a safety interlock in the combustion or venting circuit
• OEM-specified part number ensures correct fit and calibration
• Replaces failed or out-of-spec pressure switches causing ignition lockout

Compatibility

Designed for use with AO SMITH GAHH-40 and GAHH-50 gas water heater models.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC technician. Shut off gas supply and disconnect power to the water heater control circuit before beginning service. Verify all tubing connections to the pressure switch port are secure and free of cracks or blockages before restoring power. Follow applicable local codes and manufacturer service documentation during replacement.

Technical Specifications

• Type: Replacement Part
• Compatible Models: GAHH-40, GAHH-50

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100111914