Furnace

Model # GMNT120-5B Official Goodman gas furnace

Here are the diagrams and repair parts for Official Goodman GMNT120-5B gas furnace, as well as links to manuals and error code tables, if available.

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Browse Parts for
GMNT120-5B Gas Furnace
Furnace Hot-surface Ignition Control Board B1809913S
#291

Misc. components/drain kit assembly diagram

Furnace hot-surface ignition control board

Part #B1809913S

This item is not returnable
$216.75
5% OFF Phone Price : $228.75
In Stock
Igniter B1401015S
#131

Burner box assembly diagram

Igniter

Part #B1401015S

Replaced by #B1401018S

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Manufacturer substitution
This part replaces B1401015S. Substitute parts can look different from the original.
$43.19
12% OFF Phone Price : $49.19
In Stock
Motor B4059001
#111

Heat exchanger assembly diagram

Motor

Part #B4059001

Replaced by #0131M00002PSP

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Manufacturer substitution
This part replaces B4059001. Substitute parts can look different from the original.
$126.90
20% OFF Was : $158.40
In Stock
Goodman Mount Band-motor (heavy Duty) B1376862
#251A

Blower assembly diagram

Goodman mount band-motor (heavy duty)

Part #B1376862

In Stock
Arm B1376857
#261

Blower assembly diagram

Arm

Part #B1376857

$6.76
21% OFF Was : $8.51
In Stock
Furnace Flue Restrictor Plate 4028000
#81

Heat exchanger assembly diagram

Furnace flue restrictor plate

Part #4028000

This item is not returnable
In Stock
Switch B1370195
#91H

Heat exchanger assembly diagram

Switch

Part #B1370195

In Stock
Furnace Heat Exchanger 4821402S
#61I

Heat exchanger assembly diagram

Furnace heat exchanger

Part #4821402S

$459.39
$12.00 OFF Phone Price : $471.39
In Stock
Furnace Primary Heat Exchanger, 24.5-in 4821404S
#61K

Heat exchanger assembly diagram

Furnace primary heat exchanger, 24.5-in

Part #4821404S

$603.67
$12.00 OFF Phone Price : $615.67
In Stock
Furnace Vent Safety Switch B1370254

#NI01

All parts diagram

Furnace vent safety switch

Part #B1370254

In Stock

Symptoms for top-mount refrigerators

Main causes: frozen or clogged defrost drain tube, cracked water system tubing…

Repair guides for top-mount refrigerators

How to replace the electronic control board inside a top-freezer refrigerator

How to replace the electronic control board inside a top-freezer refrigerator

The electronic control board is the "brains" of the refrigerator. Replace the electronic control board if it fails.…

Repair difficulty
Time required
 15 minutes or less
How to replace a refrigerator temperature control thermostat

How to replace a refrigerator temperature control thermostat

This helpful refrigerator repair guide explains how to replace the temperature control thermostat in a refrigerator.…

Repair difficulty
Time required
 15 minutes or less
How to replace the condenser fan motor in a top-freezer refrigerator

How to replace the condenser fan motor in a top-freezer refrigerator

The condenser fan is in the machine compartment of the refrigerator next to the compressor. It moves air across the cond…

Repair difficulty
Time required
 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.…

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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