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The Goodman 10123535 is an OEM red-body manual-reset high-limit switch for the WGFM195090S5DAC gas furnace. The red button typically identifies a specific trip temperature within the furnace's safety stack, so it is important to install the correct color/rating rather than substituting a similar-looking switch. It opens the control circuit on an overheat event and holds open until manually reset, protecting the heat exchanger from thermal damage.
This genuine Goodman part matches the exact temperature set point coded to the red switch position and the correct terminal and mounting pattern. Generic replacements or the wrong-color switch can trip at the wrong temperature and compromise safe operation. Choose OEM for safety components.
Easy to Moderate — Disconnect power, pull the spade terminals, remove the mounting screws, and fit the new switch in the same location and orientation. Verify the color/rating matches the part removed and address any recurring overheat cause.