OEM Goodman Primary Limit Switch for AMH80403ANBB — 20162901

OEM Goodman 20162901 Primary Limit Switch

The genuine Goodman 20162901 primary limit switch is the main high-temperature safety control for the AMH80403ANBB gas furnace. Mounted on the heat-exchanger bulkhead, it continuously monitors supply-plenum temperature and opens the burner circuit if the furnace overheats — typically due to a dirty filter, failing blower, or blocked ducting. A furnace that short-cycles on heat or shuts the burners down mid-cycle is often signaling a failed or nuisance-tripping primary limit.

Specifications

• Part number: 20162901
• Type: primary (auto-reset) high-limit switch
• Function: opens burner circuit on plenum overtemperature, recloses when cooled
• Fits: Goodman/Amana AMH80403ANBB furnaces
• Factory-calibrated trip temperature for this model

OEM vs. Generic

The 20162901 is calibrated to the specific open/close temperatures Goodman engineered for this heat exchanger and blower pairing. An OEM part ensures correct cut-out timing and keeps the heat-exchanger warranty intact. Generic replacements with the wrong set point cause premature shutdowns or, worse, allow overheating. For the primary safety limit, OEM is the right call.

Installation Difficulty

Easy — 15–25 minutes. Disconnect power, unplug the terminals, remove two mounting screws, and install the replacement in the same orientation. Never jumper the limit. If it keeps opening, correct the airflow restriction first.

Verify the AMH80403ANBB model number before ordering to ensure the correct temperature rating.