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The Goodman 10123533 is an OEM manual-reset high-limit safety switch for the AMV91155DXBA gas furnace. This normally-closed thermal switch opens the ignition/gas control circuit if it senses an over-temperature or flame-rollout condition — protecting the heat exchanger and cabinet from heat damage and preventing unsafe operation. Because it is a manual reset device, it will not automatically re-close, forcing an inspection before the furnace can run again.
The genuine 10123533 is calibrated to the exact trip temperature specified for the AMV91155DXBA. A generic switch with a different setpoint can nuisance-trip on normal high-fire cycles or, worse, fail to open when it should. On a safety component, matching the OEM trip point is critical — do not substitute an uncalibrated aftermarket switch.
Easy (2/5). Two spade terminals and one or two mounting screws. A DIYer can replace it in about 15–20 minutes. Note: if this switch keeps tripping, replacing it does not fix the root cause — investigate airflow, the blower, and the heat exchanger. Shut off power and gas before servicing.