Resideo Q390A1053/U Universal Thermocouple

Product Description

The RESIDEO Q390A1053/U is a universal 30-millivolt thermocouple designed for use in standing-pilot gas heating systems. A thermocouple is a safety device that generates a small DC voltage when its tip is heated by the pilot flame. That voltage holds the gas valve open. If the pilot goes out, the voltage drops, and the valve closes automatically, preventing unburned gas from accumulating. The Q390A1053/U is installed by licensed HVAC technicians and gas-appliance service professionals as a direct replacement in residential and light-commercial heating equipment.

This thermocouple is suited for standing-pilot gas furnaces, boilers, water heaters, and wall heaters that use a standard millivolt pilot safety circuit. The universal design accommodates a wide range of appliances where a 30-millivolt thermocouple with a standard connection fitting is the specified replacement. No input data named specific compatible model families, so verify the appliance manufacturer's thermocouple specification before installation.

Key Features

• 30-millivolt output supports standard standing-pilot gas valve safety circuits
• Universal fit intended to replace thermocouples across a broad range of gas appliances
• Compact and lightweight at 0.1 pounds for easy handling in confined spaces
• Standard connection fitting for straightforward field replacement

Compatibility

Designed as a universal OEM-style replacement thermocouple for residential and light-commercial standing-pilot gas appliances including furnaces, boilers, water heaters, and wall heaters that specify a 30-millivolt thermocouple.

Installation Notes

Installation should be performed by a qualified HVAC technician or licensed gas-appliance service professional in accordance with local codes and the appliance manufacturer's service instructions. Always shut off the gas supply and allow the appliance to cool before removing the old thermocouple. Thread the connection nut finger-tight first, then snug with a wrench — do not overtighten, as the soft fitting can be damaged. Verify pilot flame engulfment of the thermocouple tip after reinstallation before returning the appliance to service.

Technical Specifications

• Output: 30 millivolts
• Weight: 0.1 pounds

Standard Information

• Brand: RESIDEO
• Manufacturer Part Number: Q390A1053/U