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The 10123529 is a genuine Goodman/Amana OEM manual reset limit switch built for the AMH80803BXAA gas furnace. This is a safety-critical control: it opens the circuit and shuts the furnace down if it detects an over-temperature or flame-rollout condition at the burner box or heat exchanger. Unlike auto-reset limits, a manual reset switch stays tripped until a technician presses the reset button — a deliberate design that forces the underlying fault (blocked flue, cracked exchanger, restricted airflow) to be found and corrected before the furnace can fire again.
This genuine OEM switch is calibrated to the exact trip temperature your furnace's certification requires. Substituting a generic limit with a different set point defeats the manufacturer's safety design and can create a genuine fire/CO hazard. Always match the OEM part on a safety control.
Moderate (2 of 5). Cut power at the service switch, photograph and disconnect the two wire leads, remove the mounting screws, and install the replacement in the same orientation. If the new switch trips immediately, do not bypass it — diagnose the airflow or combustion fault first.
Because this is a safety device, professional installation is strongly recommended.