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The 1370908S is a genuine OEM high-limit safety switch engineered for the Goodman GMPE125-5 gas furnace. Mounted on the heat exchanger, it monitors plenum temperature and opens the burner circuit if the furnace overheats — protecting the exchanger and blower from thermal damage. A failed limit switch is a common cause of short-cycling, no-heat calls, and repeated ignition lockouts.
Our OEM Goodman switch matches the factory temperature calibration and probe geometry exactly, ensuring correct safety trip points. Aftermarket generics may carry a lower price but often use looser tolerances that trip early (nuisance shutdowns) or late (unsafe). For a safety-critical component, we recommend the OEM part.
A two-wire, single-fastener swap that most homeowners can complete in 10–15 minutes with a nut driver. Always shut off gas and electrical power at the disconnect before servicing. If you are unsure of the fault, have an HVAC technician confirm the diagnosis before replacing.
Fits Goodman GMPE125-5. Verify your part number against the old switch before ordering.