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Goodman
Furnace

Model # GMTH045-3B Official Goodman gas furnace

Here are the diagrams and repair parts for Official Goodman GMTH045-3B gas furnace, as well as links to manuals and error code tables, if available.

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Installation guide

Model diagram and schematic

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Showing 10 of 154 parts  |
Furnace Hot-surface Ignition Control Board (replaces 18099-13s, B18099-13s) B1809913S
#291

Misc. components/drain kit assembly diagram

Furnace hot-surface ignition control board (replaces 18099-13s, b18099-13s)

Part #B1809913S

$185.31 | 
5% OFF Phone Price : $195.31
In Stock
Flame Sensor B1172606
#141

Burner box assembly diagram

Flame sensor

Part #B1172606

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

Furnace Secondary Heat Exchanger 4021309S
#61C

Heat exchanger assembly diagram

Furnace secondary heat exchanger

Part #4021309S

$192.79 | 
5% OFF Phone Price : $202.79
In Stock
Furnace Auxiliary Limit Control (replaces B13701-11) B13701-55
#401

Blower assembly diagram

Furnace auxiliary limit control (replaces b13701-11)

Part #B13701-55

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

Arm B1376857
#261

Blower assembly diagram

Arm

Part #B1376857

$8.51 | 
11% OFF Phone Price : $9.51
In Stock
Furnace Temperature Limit Switch B1370198
#91

Heat exchanger assembly diagram

Furnace temperature limit switch

Part #B1370198

$27.29
In Stock
Furnace Gas Valve (replaces 0151m00013s) B1282628
#211

Burner box assembly diagram

Furnace gas valve (replaces 0151m00013s)

Part #B1282628

$114.39 | 
8% OFF Phone Price : $124.39
In Stock
Capacitor B945672
#281

Misc. components/drain kit assembly diagram

Capacitor

Part #B945672

Replaced by #CAP125000370RPP

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Manufacturer substitution
This part replaces B945672. Substitute parts can look different from the original.
This item is not returnable
$31.20 | 
14% OFF Phone Price : $36.20
In Stock
Goodman Serv. Ht Exch 4cl 21i Model A 4021310S
#61D

Heat exchanger assembly diagram

Goodman serv. ht exch 4cl 21i model a

Part #4021310S

$284.55
In Stock
Furnace Air Pressure Switch B1370148
#351A

Misc. components/drain kit assembly diagram

Furnace air pressure switch

Part #B1370148

$57.18
In Stock

Symptoms for gas cooktops

Why won't my cooktop's gas burners ignite or spark?

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

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

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

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Why do my cooktop's spark igniters keep clicking?

Main causes: stuck burner igniter switch, wet igniter switch contacts, faulty spark module…

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Repair guides for gas cooktops

How to replace a spark igniter switch on a gas cooktop

How to replace a spark igniter switch on a gas cooktop

Follow these step-by-step instructions to fix the surface burner ignition system on your gas cooktop by replacing the sp…

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Repair difficulty
Time required
 45 minutes or less
How to replace a spark module on a gas cooktop

How to replace a spark module on a gas cooktop

No flame on your gas cooktop? Installing a new spark module could be the fix you need.…

Read more
Repair difficulty
Time required
 30 minutes or less

Effective articles & videos to help repair your furnaces

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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.…

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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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