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Model # GH120 Official Amana gas horizontal furnace
Here are the diagrams and repair parts for Official Amana GH120 gas horizontal furnace, as well as links to manuals and error code tables, if available.
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Browse Parts for
GH120 Gas Horizontal Furnace
#3A
Renewal parts diagram
Top and/or bottom panel assembly
Part #594-1100
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Blower shaft - 3/4 x 10-11/16
Part #20-4186
The manufacturer no longer makes this part, and there's no substitute part
#42B
Renewal parts diagram
Furnace blower wheel
Part #20-5045
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Blower bearing (2 req'd) 3/4" lau 7114
Part #20-5030
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Blower housing (w/brackets)
Part #980-1253
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Transformer, heat-cool h at40a1014
Part #21-0857
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Heat-cool relay
Part #22-9638
The manufacturer no longer makes this part, and there's no substitute part
#5B
Renewal parts diagram
Discharge end cap assembly
Part #595-6185
The manufacturer no longer makes this part, and there's no substitute part
#49B
Renewal parts diagram
Motor - belt drive, 1/3 hp-316p308
Part #20-9215
The manufacturer no longer makes this part, and there's no substitute part
#NI
All parts diagram
Blower wheel - 1/2" bore
Part #20-5065
The manufacturer no longer makes this part, and there's no substitute part
Symptoms for gas ranges
Main causes: gas supply problem, faulty pressure regulator, clogs in burner or orifice, control system failure, faulty t…
Main causes: burner igniter switch failure, bad spark module, dirty or damaged spark electrode, wiring failure…
Repair guides for gas ranges

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.…
Repair difficulty
Time required
15 minutes or less

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…
Repair difficulty
Time required
60 minutes or less

How to replace a gas range oven control board
These step-by-step instructions explain how to replace an oven control board on a gas range…
Repair difficulty
Time required
15 minutes or less
Effective articles & videos to help repair your furnaces

Get expert tips for preparing your furnace for winter. Follow maintenance tips to keep your furnace in top shape.…

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