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GMC GUN125-4B gas furnace Parts
Here are the diagrams and repair parts for GMC GUN125-4B gas furnace, as well as links to manuals and error code tables, if available.
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Browse Parts for GUN125-4B Gas Furnace
Heat exchanger assembly diagram
Upper Conn.
Part #B18103-00
The manufacturer no longer makes this part, and there's no substitute part
Misc. electrical/hardware diagram
Vent Pipe &
Part #B18105-00
The manufacturer no longer makes this part, and there's no substitute part
Casing diagram
Furnace Blower Door
Part #18223-41
The manufacturer no longer makes this part, and there's no substitute part
Blower assembly diagram
Blower Wheel
Part #B13680-46
The manufacturer no longer makes this part, and there's no substitute part
Misc. electrical/hardware diagram
Timed Fan
Part #B18099-03
The manufacturer no longer makes this part, and there's no substitute part
Heat exchanger assembly diagram
Gasket Kit
Part #13926-103
The manufacturer no longer makes this part, and there's no substitute part
Misc. electrical/hardware diagram
Rubber Sleev
Part #B18104-01
The manufacturer no longer makes this part, and there's no substitute part
Blower assembly diagram
Motor
Part #B13400-12
The manufacturer no longer makes this part, and there's no substitute part
Heat exchanger assembly diagram
Flue Restrictor (gun050-2b, Gus050-2)
Part #18248-00S
The manufacturer no longer makes this part, and there's no substitute part
Heat exchanger assembly diagram
Hose Clamp #
Part #B18100-00
The manufacturer no longer makes this part, and there's no substitute part
Repair guides for side-by-side refrigerators
How to replace an electronic control board on the back of a refrigerator
If your refrigerator isn't running, an electronic control board failure could be the problem. A service technician can d…
Repair time and Difficulty
15 minutes or less
How to replace a press-in door gasket in a side-by-side refrigerator
The door gasket seals the gap around the door to keep the cold air in and the warm air out. Replace a worn or damaged do…
Repair time and Difficulty
15 minutes or less
How to replace an ice maker in a side-by-side refrigerator
Learn how to replace the ice maker in a side-by-side refrigerator with these step-by-step instructions.…
Repair time and Difficulty
30 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.…
Find out how new DOE standards going into effect in 2023 can affect you and what you need to do.…
Get answers to frequently asked questions about Sears and Sears PartsDirect.…
Parts & More
Parts
Blower Wheel 134-2513-01Handle 749-04693A-0637Home Electronics Coil 146005311Air Grid 00604148Home Electronics Flywheel YASFX013005Camshaft 209-32201-11Cabinet X25141021Label (trade 224-91635-03Lead Connector BN39-00441BC-film,mpp 2301-001251Link-mechan 797233Shrtblk St UP00739Home Electronics Knob 23874870Bkt,backing, 191337Home Electronics Shield 126-02715-01Home Electronics Holder YEFK04129Home Electronics Capacitor 022-07433HANDLE LATC 73-837Passive Woof TCG35228607PANEL- W/CON 52420100