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The Goodman B1370254 is a genuine OEM stack overtemp limit switch built as a direct-fit replacement for the GMNTE120-5 gas furnace. The stack switch monitors flue/vent temperature at the induced-draft or collector box area. If exhaust temperatures climb too high — a sign of a blocked flue, restricted venting, or a combustion problem — the switch opens and shuts the furnace down to prevent overheating and unsafe venting conditions.
OEM vs. Generic: This genuine Goodman switch matches the factory trip temperature, bracket, and terminal layout exactly. Aftermarket stack switches can vary in calibration and fit, leading to nuisance shutdowns or inadequate protection of the venting system. For a flue-safety control, the OEM part is the dependable choice.
Install difficulty: Easy. Disconnect power to the furnace, pull the two spade terminals, remove the mounting screws, and install the new switch in the original location and orientation. If the stack switch keeps tripping, inspect the flue, vent pipe, and inducer for blockage before restoring operation.