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The genuine Goodman B1370253 is a 140°F stack / overtemp auto-reset limit switch for GMPN060-3 gas furnaces. It monitors temperature at the vent/stack area and opens the control circuit on abnormal heat — protecting against venting problems and overheating. Because it is auto-reset, it will close again once temperatures normalize, but repeated trips point to a draft or vent restriction that needs attention.
The OEM B1370253 is set to Goodman's precise 140°F point with the correct mounting profile. Substituting a differently-rated generic switch can cause nuisance shutdowns or, worse, fail to protect the vent system. OEM keeps the safety chain matched to factory spec.
Easy (2/5). Disconnect power, remove the mounting screws, transfer the spade terminals, and secure the replacement. 5–10 minutes.