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The Goodman B1370253 Stack Overtemp Switch is a genuine OEM thermal safety device for GSU080-4 gas furnaces. Positioned on the flue/vent stack, it senses excessive vent temperature and opens at 140°F to signal an overheating or improper-venting condition. This protects the vent connector and PVC piping on condensing-style installations from heat damage.
Because it guards low-temperature vent materials, the 140°F set point must be exact. This factory-original Goodman switch delivers the precise trip temperature and the correct clip/bracket for the stack. Generic thermostatic discs often carry loose tolerances that cause premature tripping or fail to protect the vent at all.
Easy (1 of 5). Disconnect power, remove the two spade connectors, unclip or unscrew the switch from the stack, and mount the replacement in the same spot with good surface contact. Roughly 10 minutes. If the switch keeps tripping, inspect for a restricted or undersized vent before returning to service.
Genuine Goodman part — in stock and shipping today.