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The Goodman 0130F00038 Auxiliary Limit Switch (light-blue cap) is a genuine OEM manual-reset safety control for the ACEC961005CNAB gas furnace. This auxiliary / rollout-style limit guards against abnormal heat conditions — such as flame rollout or a blocked flue — by opening the circuit and locking out the burners until the cause is corrected and the switch is manually reset. The light-blue color denotes its specific trip temperature within the Goodman limit family.
Color-coded limit switches are matched to an exact trip temperature. The OEM 0130F00038 guarantees you receive the correct light-blue rating Goodman engineered for this furnace. Substituting a switch with a different rating defeats the safety function — always match the OEM part for rollout and auxiliary limits.
Rating: Easy–Moderate (2/5). Disconnect power, note wire placement, remove the mounting screws, transfer the connectors, and mount the new switch in the original position. If a rollout switch has tripped, diagnose and correct the underlying cause (rollout, restricted venting) before returning the furnace to service. Allow about 15 minutes.