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The genuine Goodman 0130F00038 auxiliary limit switch, identified by its light-blue color code, is a factory replacement for the GMH950905CXAB gas furnace. This auxiliary (rollout/secondary) limit is a thermal safety device that opens the control circuit if it detects abnormal heat in the blower or burner compartment, shutting the furnace down before damage or a hazardous condition can occur. A tripped or failed auxiliary limit will prevent the furnace from firing, so a correct replacement is essential to safe operation.
Limit switches are calibrated to a specific trip temperature — the color coding matters. Installing the wrong-rated generic switch can cause nuisance shutdowns or, worse, allow the furnace to run past its safe temperature. This OEM part guarantees the correct trip point and mounting.
Easy (1/5). Two mounting screws and two push-on terminals. Disconnect power first and match the light-blue rating exactly.