{"product_id":"oem-goodman-m4-primary-limit-switch-for-amh80604bnaa-20162906","title":"OEM Goodman M4 Primary Limit Switch for AMH80604BNAA — 20162906","description":"\u003cp\u003eThe Goodman 20162906 M4 Primary Limit Switch is a genuine OEM high-limit safety control engineered for the \u003cstrong\u003eAMH80604BNAA\u003c\/strong\u003e gas furnace and other compatible Goodman and Amana 80% AFUE models. This normally-closed thermal switch monitors heat-exchanger and plenum temperature, cutting power to the gas valve if the furnace overheats due to a restricted filter, blocked ductwork, or blower failure. A working primary limit is required for safe furnace operation.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Primary high-limit switch (M4)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Normally-closed, auto-reset thermal cutout\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e AMH80604BNAA and compatible Goodman\/Amana 80% furnaces\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Direct replacement — matches OEM bracket and terminal footprint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e New, genuine OEM part\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM vs. Generic:\u003c\/strong\u003e Genuine OEM limit switches are calibrated to the exact trip temperature your furnace's control board expects, so they cycle correctly and pass safety checks. Aftermarket generics often use a wrong set point, causing nuisance lockouts or, worse, failing to trip. For a safety-critical control, OEM is the recommended choice.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation difficulty: Easy.\u003c\/strong\u003e Roughly 15–20 minutes for a competent DIYer. Turn off power and gas, remove the two mounting screws, transfer the wires one at a time, and reinstall. No special tools required. If you are unsure, have a licensed HVAC technician confirm the fault before replacing.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057606508915,"sku":"GOODMAN-5170","price":9.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-limit-switch-for-amh80604bnaa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}