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Goodman
Furnace

Model # GMPH120-5 Official Goodman gas furnace

Here are the diagrams and repair parts for Official Goodman GMPH120-5 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 40 parts  |
Igniter B14010-15S

#20

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Igniter

Part #B14010-15S

Replaced by #B1401018S

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Manufacturer substitution
This part replaces B14010-15S. Substitute parts can look different from the original.
$43.19 | 
10% OFF Phone Price : $48.19
In Stock
Transformer B11416-00

#46

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Transformer

Part #B11416-00

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

Flame Sensor B11726-06

#19

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Flame sensor

Part #B11726-06

$16.00 | 
11% OFF Phone Price : $18.00
In Stock
Vent Blr Asy 18590-05S

#13

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Vent blr asy

Part #18590-05S

Replaced by #B18590-05S

?
Manufacturer substitution
This part replaces 18590-05S. Substitute parts can look different from the original.
$261.53 | 
$10.00 OFF Phone Price : $271.53
In Stock
Gas Valve Hs B12826-14

#25

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Gas valve hs

Part #B12826-14

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

Furnace Burner Roll-out Limit Switch (replaces B13701-45, B1370154) B13701-54

#21

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Furnace burner roll-out limit switch (replaces b13701-45, b1370154)

Part #B13701-54

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

Chimney (gmp B25235-00

#41

All parts diagram

Chimney (gmp

Part #B25235-00

Replaced by #4053501S

?
Manufacturer substitution
This part replaces B25235-00. Substitute parts can look different from the original.
$48.49
In Stock
Limit Switch 13709-14S

#9

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Limit switch

Part #13709-14S

Replaced by #1370914S

?
Manufacturer substitution
This part replaces 13709-14S. Substitute parts can look different from the original.
$48.84
In Stock
Board 18099-13S

#47

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Board

Part #18099-13S

Replaced by #B1809913S

?
Manufacturer substitution
This part replaces 18099-13S. Substitute parts can look different from the original.
$185.31 | 
5% OFF Phone Price : $195.31
In Stock
Motor,direct B13400-22

#34

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Motor,direct

Part #B13400-22

Replaced by #B13400-22S

?
Manufacturer substitution
This part replaces B13400-22. Substitute parts can look different from the original.
$320.69
In Stock

Symptoms for treadmills

Choose a symptom to see related treadmill repairs.

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Why won't my treadmill power up?

Main causes: no power, bad power cord, tripped or faulty overload switch, bad power switch, wiring failure, bad motor co…

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Why is my treadmill's walking belt off center?

Main causes: rear roller out of alignment, damaged walking belt, bad roller…

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Why won't my treadmill start even though the console display works?

Main causes: missing safety key, bad control console, wiring failure, faulty motor control board, bad drive motor…

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Why is my treadmill's heart rate sensor not accurate?

Main causes: faulty sensors, wiring failure, bad control console…

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Why does my treadmill have no display?

Main causes: bad control console, wiring failure, bad motor control board…

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Why does my treadmill's walking belt slow down?

Main causes: damaged walking belt, improper belt tension, lack of belt lubricant, bad drive motor…

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Why is my treadmill's walking belt slipping?

Main causes: damaged walking belt, improper belt tension, bad roller bearing…

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Repair guides for treadmills

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

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How to replace a treadmill motor controller

How to replace a treadmill motor controller

Your treadmill motor won't run with a defective motor controller. Replace the motor controller if it doesn't operate the…

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Repair difficulty
Time required
 15 minutes or less
How to replace a treadmill walking belt

How to replace a treadmill walking belt

A worn walking belt will begin to slow down during use. If your treadmill walking belt is worn out, replace it using the…

Read more
Repair difficulty
Time required
 45 minutes or less
How to replace a treadmill drive motor

How to replace a treadmill drive motor

A defective drive motor won't run when activated by the motor controller. Replace the treadmill drive motor if it doesn'…

Read more
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 treadmill.

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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

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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