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This genuine Goodman 0130F00038 auxiliary limit switch (light blue) is the OEM-direct safety control for ACVM960805DXAA furnaces and compatible Goodman/Amana models. The auxiliary limit is a normally-closed thermal cutout that opens if temperatures climb past the rated trip point, shutting the gas valve to protect the heat exchanger and cabinet. The light-blue color identifies its specific temperature rating—using the wrong-rated switch can cause nuisance trips or unsafe operation.
Limit switches are calibrated to a precise trip temperature. The genuine Goodman part guarantees the correct rating and bracket geometry, so it seats properly and trips only when it should. Generic switches with mismatched ratings are a common cause of intermittent no-heat calls. Always match the OEM color and number.
Easy — usually two screws and two spade terminals. Cut power, note the wire positions, mount the new switch in the same orientation, and reconnect. A 10-minute job for most techs and confident DIYers.