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The Goodman 10123533 Manual Reset Limit Switch is a genuine OEM safety control for the WGFM195090S5DAB 95% AFUE gas furnace and compatible Goodman/Amana models. This normally-closed thermal switch opens and cuts power to the gas valve if it detects excessive heat or a flame rollout condition, protecting the furnace and home from overheating. Because it is a manual reset device, it must be pressed to reset after a trip — and a switch that will not reset or trips repeatedly needs replacement.
As a safety-critical component, the genuine OEM 10123533 is calibrated to the exact trip temperature specified for your furnace. Generic or mismatched-temperature switches can trip early (nuisance lockouts) or, worse, fail to trip when needed. Never substitute an incorrect limit switch — always use the OEM-rated part.
Easy (1.5 of 5). Disconnect furnace power, note wire positions, remove the mounting screws, transfer the leads to the new switch, and remount. Verify the switch is seated flat against the surface it monitors. Because it protects against overheating, have a licensed HVAC technician confirm proper furnace operation after replacement.