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The Goodman 20269903 is a genuine OEM auxiliary high-limit auto-reset switch for the GMV80905CXBA gas furnace. This thermal safety control monitors temperature in the blower or burner area and opens the circuit if the furnace overheats — typically due to a dirty filter, blocked airflow, or blower failure — then automatically resets once temperatures return to normal. A failed limit switch can cause nuisance shutdowns, short cycling, or a furnace that will not fire at all.
Limit switches are calibrated to a specific trip temperature. Installing a generic switch with the wrong set point can either nuisance-trip or, worse, fail to protect the heat exchanger. This OEM switch is factory-calibrated to Goodman's exact specification for the GMV80905CXBA — never substitute an unmatched temperature rating on a safety device.
Easy. Disconnect power, remove the two mounting screws, transfer the spade connectors, and reinstall. Typically 10–15 minutes with basic tools. As a safety component, verify correct operation after installation or have a licensed HVAC technician confirm the repair.