Ao Smith 100093812 Door Switch Kit Natural Gas FG50T40

Product Description

The AO SMITH 100093812 is a door switch replacement kit designed for natural gas water heaters in the FG50T40 product line. The door switch is a safety interlock component that prevents the burner from operating when the access panel or combustion chamber door is open or improperly seated. This kit provides the hardware needed to restore correct burner lockout function after switch failure or panel damage. Installation is typically performed by a licensed plumber or gas appliance technician familiar with natural gas water heater service procedures.

This kit is intended for use on AO SMITH natural gas water heaters in the FG50T40 series. It is suited for residential water heater installations where the original door switch has failed, is damaged, or is no longer making proper contact. Replacing this component restores the safety interlock circuit and allows the burner assembly to operate as designed. This is an OEM-style replacement kit that matches the original mounting configuration and switch geometry of the target unit.

Key Features

• Replacement door switch kit for natural gas AO SMITH water heaters
• Restores burner safety interlock function after switch failure
• Designed for FG50T40 series natural gas water heater models
• OEM-style fit for direct replacement without modification

Compatibility

Designed as a direct OEM-style replacement for AO SMITH FG50T40 series natural gas water heaters. Verify the model number and existing switch configuration before ordering.

Installation Notes

Shut off the gas supply and allow the water heater to cool before beginning any service work. This component should be installed by a licensed plumber or qualified gas appliance technician in accordance with applicable local codes and the manufacturer service documentation. Inspect the door panel and surrounding gasket surfaces for damage before installing the new switch. Confirm proper door seating and switch engagement before restoring gas supply and relighting the burner.

Technical Specifications

• Fuel Type: Natural Gas
• Application: FG50T40 Series Water Heater

Standard Information

• Brand: AO SMITH
• Manufacturer Part Number: 100093812