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The B1370198 is a genuine Goodman primary high-limit switch built as an exact-fit replacement for the Goodman DHS80704BXA gas furnace. Mounted on the heat-exchanger vestibule, this normally-closed thermal control continuously senses plenum temperature and interrupts the burner circuit if the furnace exceeds its 150°F set point. It is the front-line overheat protection that keeps the heat exchanger from operating outside its rated temperature during low-airflow or high-static conditions.
When a primary limit fails open or trips prematurely, the classic symptoms are a furnace that lights, runs briefly, then shuts down and repeats — or one that produces no heat at all. Replacing a fatigued limit restores reliable, safe cycling.
Choosing the genuine Goodman OEM switch guarantees the correct 150°F calibration and mounting geometry. Universal aftermarket limits frequently use a different trip point or bracket, which can cause nuisance trips or leave the heat exchanger under-protected. On a life-safety control, OEM is the right call.
Rating: Easy (2/5). A straightforward two-screw, two-terminal replacement, about 15–25 minutes. Cut gas and electrical power first. Given its safety role, have a qualified technician confirm proper airflow and normal furnace operation afterward.