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GMC GUN075-3B gas furnace Parts
Here are the diagrams and repair parts for GMC GUN075-3B gas furnace, as well as links to manuals and error code tables, if available.
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Browse Parts for GUN075-3B Gas Furnace
Heat exchanger assembly diagram
Flue Rstrctr
Part #18248-12S
The manufacturer no longer makes this part, and there's no substitute part
Heat exchanger assembly diagram
Limit, 160f,
Part #B13700-08
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
Heat exchanger assembly diagram
Comb Box Frt
Part #18820-15
The manufacturer no longer makes this part, and there's no substitute part
Heat exchanger assembly diagram
Secondary Air Door (gus075-3)
Part #18820-07
The manufacturer no longer makes this part, and there's no substitute part
Heat exchanger assembly diagram
Secondary Ai
Part #18224-09
The manufacturer no longer makes this part, and there's no substitute part
Misc. electrical/hardware diagram
Rubber Coupl
Part #B18104-00
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
Gas train diagram
Burner Assembly
Part #B18225-10
The manufacturer no longer makes this part, and there's no substitute part
Heat exchanger assembly diagram
Heat Exchange
Part #18212-29S
The manufacturer no longer makes this part, and there's no substitute part
Symptoms for electric water heaters
Main causes: thermostats need adjustment, bad heating elements, faulty thermostats, tank sediment build-up, broken dip t…
Main causes: excessive tank sediment, high voltage supply…
Repair guides for electric water heaters
How to replace a water heater element
If your water heater runs out of hot water quickly and one of the two heating elements has failed, replace the element f…
Repair time and Difficulty
30 minutes or less
How to replace a water heater temperature and pressure (T&P) relief valve
Replace a broken temperature/pressure (T&P) relief valve on an electric water heater using these instructions.…
Repair time and Difficulty
15 minutes or less
How to replace an electric water heater thermostat
If the water temperature fluctuates or you don't get enough hot water, follow these instructions to replace your water h…
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.…
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