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The Goodman 10123529 Manual Reset Limit Switch is a genuine OEM safety control for the Goodman ACEC800804BXAB and compatible gas furnaces. This high-limit / rollout switch monitors temperature and opens to shut off the burners if the furnace overheats or flame rollout occurs. Because it is a manual-reset device, it must be physically reset after a trip — a built-in safeguard that signals an underlying issue should be investigated. A failed switch can cause no-heat lockouts or fail to protect the system.
The OEM 10123529 is calibrated to the exact trip temperature specified for this furnace. Substituting a generic switch with a different setpoint can compromise safety or cause nuisance trips. For correct, code-compliant protection, OEM is essential.
Easy (2/5). Disconnect power, unplug the two terminals, unscrew the switch, and mount the replacement. Always diagnose the cause of any trip. Typical time: 15–20 minutes.