{"product_id":"oem-goodman-m4-primary-high-limit-switch-for-amss920803bnaa-20162906","title":"OEM Goodman M4 Primary High-Limit Switch for AMSS920803BNAA — 20162906","description":"\u003cp\u003eThe Goodman \u003cstrong\u003e20162906 M4 Primary Limit Switch\u003c\/strong\u003e is the genuine OEM high-temperature limit control for the Amana\/Goodman \u003cstrong\u003eAMSS920803BNAA\u003c\/strong\u003e gas furnace. Positioned in the heat-exchanger \/ supply-air path, this primary limit continuously monitors plenum temperature and de-energizes the gas valve if the furnace overheats — the most common cause being restricted airflow from a dirty filter, closed registers, or a failing blower. It is an auto-reset device that re-closes once temperature returns to normal.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003ePart type: Primary high-limit (auto-reset) switch\u003c\/li\u003e\n\u003cli\u003eSeries: M4 disc limit\u003c\/li\u003e\n\u003cli\u003eAction: Normally closed, opens on overtemperature\u003c\/li\u003e\n\u003cli\u003eReset: Automatic on cooldown\u003c\/li\u003e\n\u003cli\u003eFitment: Amana \u0026amp; Goodman furnaces (AMSS920803BNAA and related)\u003c\/li\u003e\n\u003cli\u003eOEM part number: 20162906\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eOEM vs. Generic\u003c\/h3\u003e\u003cp\u003eThe OEM 20162906 ships with the correct disc trip point, insertion depth, and mounting-plate cutout for this furnace. A generic disc limit with the wrong open temperature will either short-cycle the furnace on heat or fail to protect the heat exchanger. For the primary safety limit, matching the OEM part number is strongly advised.\u003c\/p\u003e\u003ch3\u003eInstall Difficulty\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eModerate (2\/5).\u003c\/strong\u003e Disconnect power, remove the two mounting screws, transfer the wire leads, and reinstall so the sensing disc sits in the airstream at the original depth. If the new limit keeps opening, correct the airflow restriction before returning the unit to service.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63057773494643,"sku":"GOODMAN-7447","price":9.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-m4-primary-high-limit-switch-for-amss920803bnaa-20162906","provider":"National HVAC Parts","version":"1.0","type":"link"}