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The Goodman 10123517 is a genuine OEM manual reset high limit switch designed for the WGFD295090V5DAA gas furnace and compatible Goodman/Amana models. This safety device monitors temperature and opens the control circuit if the furnace overheats — protecting the heat exchanger and household from dangerous conditions. Because it is a manual reset model, it must be pressed to reset after a trip, alerting the homeowner that an overheat event occurred.
A limit switch is a safety component, so the trip temperature must match Goodman's engineering spec exactly. Generic switches with the wrong setpoint can either trip too early (nuisance shutdowns) or too late (unsafe operation). This OEM switch carries the correct calibration and mounting footprint for a true drop-in fit.
Typically a 15 to 20 minute replacement. Shut off power and gas, remove the access panel, note the wire positions, disconnect the terminals, unscrew the switch, and mount the new unit in the same orientation. Restore power and test for normal operation. Because this is a safety control, if the switch keeps tripping do not bypass it — have a licensed HVAC technician diagnose the root cause.