Thermal Zone
Furnace

Model # GD100M16B Official Thermal Zone gas furnace

Here are the diagrams and repair parts for Official Thermal Zone GD100M16B 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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Showing 10 of 27 parts  |

Capacitor 621435
#7

90+ downflow furnace diagram

Capacitor

Part #621435

Replaced by #12908

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Manufacturer substitution
This part replaces 621435. Substitute parts can look different from the original.
This item is not returnable
$5.26
16% OFF Phone Price : $6.26
In Stock
Furnace Electronic Control Board 903106
#9

90+ downflow furnace diagram

Furnace electronic control board

Part #903106

In Stock
Furnace Blower Assembly 902815
#4

90+ downflow furnace diagram

Furnace blower assembly

Part #902815

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

Orifice 661045
#14

90+ downflow furnace diagram

Orifice

Part #661045

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

Furnace Vent Limit Switch, 160-degree 626461
#24

90+ downflow furnace diagram

Furnace vent limit switch, 160-degree

Part #626461

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

Central Air Conditioner Air Handler Drain Pan Connector 663714
#20

90+ downflow furnace diagram

Central air conditioner air handler drain pan connector

Part #663714

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

Sensor Rod 632316
#13

90+ downflow furnace diagram

Sensor rod

Part #632316

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

Limit Sw 626418
#17

90+ downflow furnace diagram

Limit sw

Part #626418

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

Gas Valve 624586
#11

90+ downflow furnace diagram

Gas valve

Part #624586

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

Pressure Swt 632252
#16

90+ downflow furnace diagram

Pressure swt

Part #632252

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

Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

Repair guides for gas walk-behind mowers

These step-by-step repair guides will help you safely fix what’s broken on your walk-behind lawn mower.

How to replace a lawn mower spark plug

How to replace a lawn mower spark plug

Take a few minutes to replace the spark plug during your lawn mower's annual tune-up or if the spark plug is burnt or cr…

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower blade

How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower flywheel key on a flathead engine

How to replace a lawn mower flywheel key on a flathead engine

When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…

Repair difficulty
Time required
 45 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 walk-behind lawn mower.

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.…

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.…

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.…