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The Goodman 0130F00038 is a genuine OEM auxiliary (secondary) limit switch, identified by its light blue color-coded cap, for the Amana/Goodman AMH81005CNBD gas furnace. This normally-closed thermal safety switch guards a secondary location in the furnace and opens the control circuit if it senses an over-temperature condition, adding a layer of protection beyond the primary limit control.
Goodman color-codes these switches because each color corresponds to a specific trip temperature. Installing the wrong temperature switch can cause nuisance trips or defeat the safety function entirely. The OEM 0130F00038 guarantees the correct light-blue calibration for your furnace — do not substitute by color alone from another brand.
Easy (2/5) — Mounts with two screws and two spade terminals; about 15 minutes. Shut off power and gas before servicing, and match the replacement to the original color code. A simple, inexpensive safety repair.
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