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The B1370108 is a genuine OEM Goodman flame rollout limit switch rated to trip at 300°F, designed as a direct replacement for the GUS075-3 gas furnace. This manual-reset safety device shuts off the gas valve if flames roll out of the burner box due to a blocked heat exchanger, cracked flue, or restricted venting — protecting your equipment and home from overheating.
The OEM Goodman switch is calibrated to the precise 300°F trip point Goodman engineered for this furnace's burner geometry. Because this is a life-safety component, using a mismatched generic switch risks nuisance trips or, worse, a failure to trip. We strongly recommend OEM for all safety limits.
Two mounting screws and two quick-connect spade terminals. A confident DIYer can complete it in under 15 minutes. Disconnect power and shut off gas first. If the switch has tripped, always diagnose the root cause (dirty burners, blocked flue) before resetting.