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The Goodman B1370254 Stack Overtemp Switch is a genuine OEM thermal safety control for the GMNTE080-4 gas furnace. Installed on the flue/vent stack, this overtemp limit monitors exhaust temperature and opens the control circuit if the venting overheats — a condition that can indicate a blocked flue, cracked heat exchanger, or improper combustion. It shuts the furnace down to prevent unsafe operation.
The OEM Goodman B1370254 is factory-matched to the correct trip temperature and stack mounting for reliable venting protection. Our generic replacement offers the same safety function at a reduced price for out-of-warranty service. Because this switch guards flue safety, we recommend OEM whenever possible. Both are UL-recognized.
Easy to Moderate (2/5). Shut off power and gas, allow the flue to cool, then remove the mounting screws and spade terminals and fit the new switch on the stack. Access can be tighter than panel-mounted limits. Verify proper draft and combustion after replacement.