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Thermal Zone
Furnace

Model # GM072K12B Official Thermal Zone gas furnace

Here are the diagrams and repair parts for Official Thermal Zone GM072K12B gas furnace, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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ALL PARTS
Showing 10 of 31 parts  |
Blower Wheel 667251
#20

80+ upflow furnace diagram

Blower wheel

Part #667251

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

Furnace Control Module Assembly 903108
#25A

80+ upflow furnace diagram

Furnace control module assembly

Part #903108

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

Furnace Electronic Control Board 903106
#25

80+ upflow furnace diagram

Furnace electronic control board

Part #903106

$297.66
In Stock
Gas Valve 624586
#2

80+ upflow furnace diagram

Gas valve

Part #624586

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

Furnace Burner Flame Roll-out Switch 626343
#7

80+ upflow furnace diagram

Furnace burner flame roll-out switch

Part #626343

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

Sensor Rod 632316
#6

80+ upflow furnace diagram

Sensor rod

Part #632316

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

Transformer 621486
#24

80+ upflow furnace diagram

Transformer

Part #621486

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

Limit Sw 626418
#18

80+ upflow furnace diagram

Limit sw

Part #626418

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

Switch 632212
#17

80+ upflow furnace diagram

Switch

Part #632212

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

Capacitor 621433
#22

80+ upflow furnace diagram

Capacitor

Part #621433

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

Symptoms for band saws

Choose a symptom to see related band saw repairs.

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Why does my band saw blade slip off the wheel?

Main causes: damaged rubber tire, worn wheel bearings, loose blade tension, dull saw blade…

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Why does my band saw make ragged cuts?

Main causes: dull blade, using the wrong type of blade, feeding work piece to quickly, loose blade tension…

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Why does my band saw make inaccurate bevel cuts?

Main causes: angle indicator needs adjustment, dull blade…

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Why won't my band saw cut straight?

Main causes: dull blade, improper feeding, loose blade tension, not using a work piece guide…

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Why won't my my band saw's blade move?

Main causes: broken saw blade, bad drive belt, damaged rubber tire…

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Why is my band saw cutting slowly?

Main causes: dull blade, using the wrong type of blade, weak drive motor…

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Why won't my band saw start?

Main causes: lack of electrical power, broken power cord, bad on/off switch, faulty drive motor…

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Repair guides for band saws

These step-by-step repair guides will help you safely fix what’s broken on your band saw.

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How to replace a band saw on-off switch

How to replace a band saw on-off switch

If the switch won't turn the band saw on or off, it could be defective. Replace the switch, using these steps.…

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Repair difficulty
Time required
 15 minutes or less
How to replace a band saw drive belt

How to replace a band saw drive belt

If the motor runs but the blade doesn't move, it could be that the drive belt is broken. Here's how to replace it.…

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Repair difficulty
Time required
 15 minutes or less
How to replace a band saw blade

How to replace a band saw blade

If the saw blade is dull or damaged and isn't cutting cleanly, replace the blade following these steps.…

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Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your furnaces

Use the advice and tips in these articles and videos to get the most out of your band saw.

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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.…

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Introducing new technical repair content that we’re developing for the Sears Technical Institute

Introducing new technical repair content that we’re developing for the Sears Technical Institute

Learn about Sears Technical Institute and the advanced technical content being developed for aspiring appliance techs.…

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Top questions about Sears and Sears PartsDirect

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