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The Goodman 20162901 is a genuine OEM primary high-limit switch for the ACES960603BNAA gas furnace. Mounted on the heat exchanger / blower bulkhead, this thermal safety control continuously monitors supply-air temperature. If the furnace overheats — typically from restricted airflow, a dirty filter, or blower failure — the limit opens and shuts off the gas valve to protect the heat exchanger and prevent unsafe operation. When temperatures return to normal, it automatically resets.
Limit switches are calibrated to a specific cut-out and cut-in temperature for the furnace they protect. The OEM Goodman 20162901 carries the exact trip point and mounting geometry Goodman engineered for this model. Generic substitutes with a different temperature rating can cause nuisance shutdowns or, worse, fail to trip — defeating the safety function. Match OEM for any safety control.
Easy–Moderate (2/5). Disconnect power, remove two mounting screws and the wire connectors, then install the new switch in the same orientation. Verify the furnace cycles and shuts off properly after install.