Get free shipping on your order, with any water filter subscription. Find my filter

Open Hamburger Menu
Sears Parts Direct
Tips to find your model number

Thermal Zone GM120K20C gas furnace Parts

Here are the diagrams and repair parts for Thermal Zone GM120K20C gas furnace, as well as links to manuals and error code tables, if available.

Thermal Zone GM120K20C gas furnace
By Schematic
SELECT DIAGRAM
?

This is the number corresponding to the part on the diagram / schematic

Browse Parts for GM120K20C Gas Furnace

  • Furnace Blower for Thermal Zone GM120K20C - Part 903111

    80+ upflow furnace diagram

    Furnace Blower

    Part #903111

    The manufacturer no longer makes this part, and there's no substitute part

  • Motor Mount Arm (not Shown) for Thermal Zone GM120K20C - Part 668927

    80+ upflow furnace diagram

    Motor Mount Arm (not Shown)

    Part #668927

    The manufacturer no longer makes this part, and there's no substitute part

  • Switch, Vent Limit, 240? F (not Shown) for Thermal Zone GM120K20C - Part 626355

    80+ upflow furnace diagram

    Switch, Vent Limit, 240? F (not Shown)

    Part #626355

    The manufacturer no longer makes this part, and there's no substitute part

  • Limit Switch 180/20 for Thermal Zone GM120K20C - Part 626434

    80+ upflow furnace diagram

    Limit Switch 180/20

    Part #626434

    The manufacturer no longer makes this part, and there's no substitute part

  • Vent Control Assembly for Thermal Zone GM120K20C - Part 372586

    80+ upflow furnace diagram

    Vent Control Assembly

    Part #372586

    The manufacturer no longer makes this part, and there's no substitute part

  • Heat Exchanger for Thermal Zone GM120K20C - Part 493217

    80+ upflow furnace diagram

    Heat Exchanger

    Part #493217

    The manufacturer no longer makes this part, and there's no substitute part

  • 3 Amp Circuit Board Fuse (not Shown) for Thermal Zone GM120K20C - Part 632261

    80+ upflow furnace diagram

    3 Amp Circuit Board Fuse (not Shown)

    Part #632261

    The manufacturer no longer makes this part, and there's no substitute part

  • Complete Burner Assembly for Thermal Zone GM120K20C - Part D03830

    80+ upflow furnace diagram

    Complete Burner Assembly

    Part #D03830

    The manufacturer no longer makes this part, and there's no substitute part

  • Motor Mount (not Shown) for Thermal Zone GM120K20C - Part 668926

    80+ upflow furnace diagram

    Motor Mount (not Shown)

    Part #668926

    The manufacturer no longer makes this part, and there's no substitute part

  • Furnace Burner for Thermal Zone GM120K20C - Part 660812

    80+ upflow furnace diagram

    Furnace Burner

    Part #660812

    The manufacturer no longer makes this part, and there's no substitute part

Symptoms for gas ranges

Main causes: gas supply problem, faulty pressure regulator, clogs in burner or orifice, control system failure, faulty t…

Main causes: burner igniter switch failure, bad spark module, dirty or damaged spark electrode, wiring failure…

Repair guides for gas ranges

How to replace a gas range oven igniter

How to replace a gas range oven igniter

If your gas oven doesn't heat up, the problem could be a faulty oven igniter. These step-by-step instructions guide you …

Repair time and Difficulty

 45 minutes or less
How to replace an oven temperature sensor on a gas range

How to replace an oven temperature sensor on a gas range

See how to replace an oven temperature sensor on a gas range.…

Repair time and Difficulty

 15 minutes or less
How to replace a gas range oven control board

How to replace a gas range oven control board

These step-by-step instructions explain how to replace an oven control board on a gas range…

Repair time and Difficulty

 15 minutes or less

Effective articles & videos to help repair your furnaces

How to get your furnace ready for winter

How to get your furnace ready for winter

Get expert tips for preparing your furnace for winter. Follow maintenance tips to keep your furnace in top shape.…

2023 HVAC regulation changes and how they may affect you

2023 HVAC regulation changes and how they may affect you

Find out how new DOE standards going into effect in 2023 can affect you and what you need to do.…

Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

Parts & More

Parts