Can’t find your part?   Contact us:
+1-309-603-4777
Sears Parts Direct
Tips to find your model number
Orders

  • Keep track of the models you own in your profile

    Sign in or Register to view or add models

Schedule a repair
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.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

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

Search
ALL PARTS
Showing 10 of 27 parts  |
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

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

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

Furnace Electronic Control Board 903106
#9

90+ downflow furnace diagram

Furnace electronic control board

Part #903106

$297.66
In Stock
Orifice 661045
#14

90+ downflow furnace diagram

Orifice

Part #661045

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

Capacitor 621435
#7

90+ downflow furnace diagram

Capacitor

Part #621435

Replaced by #12908

?
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
Transformer 621486
#3

90+ downflow furnace diagram

Transformer

Part #621486

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

Symptoms for gas ranges

Why won't my range's gas burner spark or ignite?

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

Read more

Why isn't my range's gas burner heating properly?

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

Read more

Repair guides for gas ranges

How to replace oven door hinges on a gas range

How to replace oven door hinges on a gas range

See how to replace the oven door hinges on a gas range yourself, in just 30 minutes.…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a range spark igniter switch

How to replace a range spark igniter switch

Follow these steps to replace the spark igniter switch—sometimes called a burner switch or spark switch—on a gas or dual…

Read more
Repair difficulty
Time required
 60 minutes or less
How to replace a range spark igniter electrode

How to replace a range spark igniter electrode

Learn how to replace the spark igniter electrode for the surface burners on a gas range or dual-fuel range.…

Read more
Repair difficulty
Time required
 45 minutes or less

Effective articles & videos to help repair your furnaces

View all
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.…

Read more
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.…

Read more
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.…

Read more

Parts & More