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The Goodman 10123529 is a genuine manual-reset high-limit safety switch for VMS81005CNAA gas furnaces and compatible Goodman/Amana models. This normally-closed thermal switch opens to shut off the gas valve if the furnace overheats or experiences flame rollout, then requires a manual reset button press to restore operation. Because it does not reset automatically, it flags a real problem that should be diagnosed before running the furnace again.
The OEM 10123529 is calibrated to the exact trip temperature specified for your furnace's heat exchanger and burner box. Generic switches with the wrong setpoint either nuisance-trip during normal operation or fail to protect against genuine overheating — a safety risk. Always match the OEM temperature rating on a limit control.
Easy (2/5). Disconnect power, note the two wire terminals, unbolt the old switch, and mount the replacement in the same orientation. Takes about 15 minutes. If the switch tripped, find and fix the root cause (dirty filter, blocked flue, weak blower) before restarting. Professional service recommended for safety-control diagnosis.