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The Goodman 10728342 is a genuine OEM high-limit safety switch engineered for the WGGE4330A070MAB gas furnace and compatible Goodman/Amana models. This temperature-sensing bimetal switch monitors heat-exchanger air temperature and cuts power to the gas valve if the furnace overheats — a critical safety component that prevents damage from restricted airflow, a dirty filter, or a failed blower. A furnace that short-cycles on heat or trips the limit is a classic sign this switch has drifted out of spec.
Choose the OEM Goodman switch for a factory-matched trip temperature and mounting footprint — no guesswork on calibration. A generic snap-disc may fit physically but can carry a different open/close set point, which risks nuisance trips or delayed shutdown. For a safety device, we recommend OEM.
Easy (1/5). Two mounting screws and two spade terminals. Cut power at the disconnect, note wire positions, swap, and restore. Most homeowners with a nut driver finish in under 15 minutes.
Always shut off electrical and gas supply before servicing. If the limit keeps tripping after replacement, have a technician check airflow and the blower.