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Genuine Goodman/Amana auxiliary high-limit switch, part 0130F00038, identified by its light-blue color code, is a direct-fit safety control for the AMVM970804CNBA gas furnace and related Goodman/Amana models. This normally-closed thermal switch opens if temperatures near the blower or heat exchanger exceed safe limits, shutting off the burners to prevent overheating. A tripped or failed limit switch causes no-heat calls, blower lockouts, or intermittent shutdowns.
The OEM switch is factory-calibrated to the exact trip temperature specified for this furnace — critical for a safety component. Generic switches may carry a different set point that nuisance-trips or fails to protect the heat exchanger. For limit and safety controls, always match the OEM color-coded rating.
Easy — about 10 minutes. Two screws and two push-on terminals. Cut power at the furnace disconnect first and note wire positions.