{"title":"Furnace Limit Switches","description":"\u003cp\u003eThe high limit switch shuts the burners off when the heat exchanger gets too hot. It is the last line of defence against a cracked exchanger and a house fire.\u003c\/p\u003e\u003cp\u003eA furnace that heats, trips out, cools, and restarts in a loop is almost always an airflow problem — a filthy filter, a closed damper, a failing blower — and the limit is reporting it, not causing it. Fix the airflow. Replace the limit when it is open at room temperature or will not reset. Match the open and close temperatures exactly; a higher-rated limit is not an upgrade, it is a defeated safety.\u003c\/p\u003e\u003cp class=\"fd-coll-terms\"\u003eShips the same business day on orders placed by 2 PM CT. 7-day returns on parts. Not sure which one you need? Call \u003cstrong\u003e(888) 762-1334\u003c\/strong\u003e — we are licensed HVAC contractors (Hamlin Mechanical LLC, MN Lic. #128688) and we would rather talk you out of the wrong part than sell it to you.\u003c\/p\u003e","products":[{"product_id":"furnace-limit-switch-3l05-1","title":"Furnace Limit Switch | 3L05-1","description":"\u003cp\u003e\u003cstrong\u003eFurnace Limit Switch\u003c\/strong\u003e — manufacturer part number \u003cstrong\u003e3L05-1\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat this part does\u003c\/h2\u003e\u003cp\u003eThe high limit switch shuts the burners down when the heat exchanger gets too hot. It is a safety device, so when it trips repeatedly the switch is usually doing its job correctly and the real fault is restricted airflow. Check the filter before you replace this.\u003c\/p\u003e\n\u003ch2\u003eReplace this part if\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFurnace heats briefly then shuts down, repeatedly\u003c\/li\u003e\n\u003cli\u003eBlower keeps running after the burners cut out\u003c\/li\u003e\n\u003cli\u003eFurnace locks out after several failed cycles\u003c\/li\u003e\n\u003cli\u003eSwitch reads open on a multimeter when cold\u003c\/li\u003e\n\u003cli\u003eBurnt or discoloured switch housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e3L05-1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eFurnace Direct (Hamlin Mechanical LLC, MN Lic. #128688)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eInstall difficulty\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eEasy\u003c\/strong\u003e — about 25 minutes. Tools: 1\/4\" nut driver, screwdriver. Power off at the breaker: yes. Gas shutoff required: no.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSafety warning:\u003c\/strong\u003e A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003cp\u003eTypical service life is 8-15 years.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I know if my furnace limit switch is bad?\u003c\/h3\u003e\u003cp\u003eReplace it if you see any of these: furnace heats briefly then shuts down, repeatedly; blower keeps running after the burners cut out; furnace locks out after several failed cycles.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a furnace limit switch myself?\u003c\/h3\u003e\u003cp\u003eYes. This is a easy repair that takes about 25 minutes with 1\/4\" nut driver, screwdriver. Always shut the power off at the breaker first. A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003ch3\u003eHow long does a furnace limit switch last?\u003c\/h3\u003e\u003cp\u003eTypically 8-15 years in normal residential use. Heavy cycling, poor airflow, and dirty filters all shorten that.\u003c\/p\u003e\n\n\u003ch3\u003eWhat if it does not fit?\u003c\/h3\u003e\u003cp\u003eReturn it within 7 days of delivery. If you are unsure before ordering, call (888) 762-1334 — we are licensed HVAC contractors and can confirm the right part for your model.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSold by licensed HVAC contractors.\u003c\/strong\u003e Furnace Direct is Hamlin Mechanical LLC, Minnesota licence #128688. If this part does not fix the problem, call (888) 762-1334 and we will help you work out what will.\u003c\/p\u003e","brand":"White-Rodgers","offers":[{"title":"Default Title","offer_id":58271395283247,"sku":"3L05-1","price":545.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/2111\/2367\/files\/3L05-1.jpg?v=1785719640"},{"product_id":"furnace-limit-switch-m39225","title":"Furnace Limit Switch | M39225","description":"\u003cp\u003e\u003cstrong\u003eFurnace Limit Switch\u003c\/strong\u003e — manufacturer part number \u003cstrong\u003eM39225\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat this part does\u003c\/h2\u003e\u003cp\u003eThe high limit switch shuts the burners down when the heat exchanger gets too hot. It is a safety device, so when it trips repeatedly the switch is usually doing its job correctly and the real fault is restricted airflow. Check the filter before you replace this.\u003c\/p\u003e\n\u003ch2\u003eReplace this part if\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFurnace heats briefly then shuts down, repeatedly\u003c\/li\u003e\n\u003cli\u003eBlower keeps running after the burners cut out\u003c\/li\u003e\n\u003cli\u003eFurnace locks out after several failed cycles\u003c\/li\u003e\n\u003cli\u003eSwitch reads open on a multimeter when cold\u003c\/li\u003e\n\u003cli\u003eBurnt or discoloured switch housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eM39225\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eFurnace Direct (Hamlin Mechanical LLC, MN Lic. #128688)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eInstall difficulty\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eEasy\u003c\/strong\u003e — about 25 minutes. Tools: 1\/4\" nut driver, screwdriver. Power off at the breaker: yes. Gas shutoff required: no.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSafety warning:\u003c\/strong\u003e A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003cp\u003eTypical service life is 8-15 years.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I know if my furnace limit switch is bad?\u003c\/h3\u003e\u003cp\u003eReplace it if you see any of these: furnace heats briefly then shuts down, repeatedly; blower keeps running after the burners cut out; furnace locks out after several failed cycles.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a furnace limit switch myself?\u003c\/h3\u003e\u003cp\u003eYes. This is a easy repair that takes about 25 minutes with 1\/4\" nut driver, screwdriver. Always shut the power off at the breaker first. A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003ch3\u003eHow long does a furnace limit switch last?\u003c\/h3\u003e\u003cp\u003eTypically 8-15 years in normal residential use. Heavy cycling, poor airflow, and dirty filters all shorten that.\u003c\/p\u003e\n\n\u003ch3\u003eWhat if it does not fit?\u003c\/h3\u003e\u003cp\u003eReturn it within 7 days of delivery. If you are unsure before ordering, call (888) 762-1334 — we are licensed HVAC contractors and can confirm the right part for your model.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSold by licensed HVAC contractors.\u003c\/strong\u003e Furnace Direct is Hamlin Mechanical LLC, Minnesota licence #128688. If this part does not fix the problem, call (888) 762-1334 and we will help you work out what will.\u003c\/p\u003e","brand":"RectorSeal","offers":[{"title":"Default Title","offer_id":58271395316015,"sku":"M39225","price":560.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/2111\/2367\/files\/M39225.jpg?v=1785719642"},{"product_id":"furnace-limit-switch-m39029","title":"Furnace Limit Switch | M39029","description":"\u003cp\u003e\u003cstrong\u003eFurnace Limit Switch\u003c\/strong\u003e — manufacturer part number \u003cstrong\u003eM39029\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat this part does\u003c\/h2\u003e\u003cp\u003eThe high limit switch shuts the burners down when the heat exchanger gets too hot. It is a safety device, so when it trips repeatedly the switch is usually doing its job correctly and the real fault is restricted airflow. Check the filter before you replace this.\u003c\/p\u003e\n\u003ch2\u003eReplace this part if\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFurnace heats briefly then shuts down, repeatedly\u003c\/li\u003e\n\u003cli\u003eBlower keeps running after the burners cut out\u003c\/li\u003e\n\u003cli\u003eFurnace locks out after several failed cycles\u003c\/li\u003e\n\u003cli\u003eSwitch reads open on a multimeter when cold\u003c\/li\u003e\n\u003cli\u003eBurnt or discoloured switch housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eM39029\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eFurnace Direct (Hamlin Mechanical LLC, MN Lic. #128688)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eInstall difficulty\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eEasy\u003c\/strong\u003e — about 25 minutes. Tools: 1\/4\" nut driver, screwdriver. Power off at the breaker: yes. Gas shutoff required: no.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSafety warning:\u003c\/strong\u003e A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003cp\u003eTypical service life is 8-15 years.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I know if my furnace limit switch is bad?\u003c\/h3\u003e\u003cp\u003eReplace it if you see any of these: furnace heats briefly then shuts down, repeatedly; blower keeps running after the burners cut out; furnace locks out after several failed cycles.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a furnace limit switch myself?\u003c\/h3\u003e\u003cp\u003eYes. This is a easy repair that takes about 25 minutes with 1\/4\" nut driver, screwdriver. Always shut the power off at the breaker first. A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003ch3\u003eHow long does a furnace limit switch last?\u003c\/h3\u003e\u003cp\u003eTypically 8-15 years in normal residential use. Heavy cycling, poor airflow, and dirty filters all shorten that.\u003c\/p\u003e\n\n\u003ch3\u003eWhat if it does not fit?\u003c\/h3\u003e\u003cp\u003eReturn it within 7 days of delivery. If you are unsure before ordering, call (888) 762-1334 — we are licensed HVAC contractors and can confirm the right part for your model.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSold by licensed HVAC contractors.\u003c\/strong\u003e Furnace Direct is Hamlin Mechanical LLC, Minnesota licence #128688. If this part does not fix the problem, call (888) 762-1334 and we will help you work out what will.\u003c\/p\u003e","brand":"RectorSeal","offers":[{"title":"Default Title","offer_id":58271395348783,"sku":"M39029","price":530.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/2111\/2367\/files\/M39029.jpg?v=1785719643"},{"product_id":"furnace-limit-switch-m39230","title":"Furnace Limit Switch | M39230","description":"\u003cp\u003e\u003cstrong\u003eFurnace Limit Switch\u003c\/strong\u003e — manufacturer part number \u003cstrong\u003eM39230\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat this part does\u003c\/h2\u003e\u003cp\u003eThe high limit switch shuts the burners down when the heat exchanger gets too hot. It is a safety device, so when it trips repeatedly the switch is usually doing its job correctly and the real fault is restricted airflow. Check the filter before you replace this.\u003c\/p\u003e\n\u003ch2\u003eReplace this part if\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFurnace heats briefly then shuts down, repeatedly\u003c\/li\u003e\n\u003cli\u003eBlower keeps running after the burners cut out\u003c\/li\u003e\n\u003cli\u003eFurnace locks out after several failed cycles\u003c\/li\u003e\n\u003cli\u003eSwitch reads open on a multimeter when cold\u003c\/li\u003e\n\u003cli\u003eBurnt or discoloured switch housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eM39230\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eFurnace Direct (Hamlin Mechanical LLC, MN Lic. #128688)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eInstall difficulty\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eEasy\u003c\/strong\u003e — about 25 minutes. Tools: 1\/4\" nut driver, screwdriver. Power off at the breaker: yes. Gas shutoff required: no.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSafety warning:\u003c\/strong\u003e A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003cp\u003eTypical service life is 8-15 years.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I know if my furnace limit switch is bad?\u003c\/h3\u003e\u003cp\u003eReplace it if you see any of these: furnace heats briefly then shuts down, repeatedly; blower keeps running after the burners cut out; furnace locks out after several failed cycles.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a furnace limit switch myself?\u003c\/h3\u003e\u003cp\u003eYes. This is a easy repair that takes about 25 minutes with 1\/4\" nut driver, screwdriver. Always shut the power off at the breaker first. A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003ch3\u003eHow long does a furnace limit switch last?\u003c\/h3\u003e\u003cp\u003eTypically 8-15 years in normal residential use. Heavy cycling, poor airflow, and dirty filters all shorten that.\u003c\/p\u003e\n\n\u003ch3\u003eWhat if it does not fit?\u003c\/h3\u003e\u003cp\u003eReturn it within 7 days of delivery. If you are unsure before ordering, call (888) 762-1334 — we are licensed HVAC contractors and can confirm the right part for your model.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSold by licensed HVAC contractors.\u003c\/strong\u003e Furnace Direct is Hamlin Mechanical LLC, Minnesota licence #128688. If this part does not fix the problem, call (888) 762-1334 and we will help you work out what will.\u003c\/p\u003e","brand":"RectorSeal","offers":[{"title":"Default Title","offer_id":58271395381551,"sku":"M39230","price":560.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/2111\/2367\/files\/M39230.jpg?v=1785719644"},{"product_id":"furnace-limit-switch-m39022","title":"Furnace Limit Switch | M39022","description":"\u003cp\u003e\u003cstrong\u003eFurnace Limit Switch\u003c\/strong\u003e — manufacturer part number \u003cstrong\u003eM39022\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat this part does\u003c\/h2\u003e\u003cp\u003eThe high limit switch shuts the burners down when the heat exchanger gets too hot. It is a safety device, so when it trips repeatedly the switch is usually doing its job correctly and the real fault is restricted airflow. Check the filter before you replace this.\u003c\/p\u003e\n\u003ch2\u003eReplace this part if\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFurnace heats briefly then shuts down, repeatedly\u003c\/li\u003e\n\u003cli\u003eBlower keeps running after the burners cut out\u003c\/li\u003e\n\u003cli\u003eFurnace locks out after several failed cycles\u003c\/li\u003e\n\u003cli\u003eSwitch reads open on a multimeter when cold\u003c\/li\u003e\n\u003cli\u003eBurnt or discoloured switch housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eM39022\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eFurnace Direct (Hamlin Mechanical LLC, MN Lic. #128688)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eInstall difficulty\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eEasy\u003c\/strong\u003e — about 25 minutes. Tools: 1\/4\" nut driver, screwdriver. Power off at the breaker: yes. Gas shutoff required: no.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSafety warning:\u003c\/strong\u003e A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003cp\u003eTypical service life is 8-15 years.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I know if my furnace limit switch is bad?\u003c\/h3\u003e\u003cp\u003eReplace it if you see any of these: furnace heats briefly then shuts down, repeatedly; blower keeps running after the burners cut out; furnace locks out after several failed cycles.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a furnace limit switch myself?\u003c\/h3\u003e\u003cp\u003eYes. This is a easy repair that takes about 25 minutes with 1\/4\" nut driver, screwdriver. Always shut the power off at the breaker first. A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003ch3\u003eHow long does a furnace limit switch last?\u003c\/h3\u003e\u003cp\u003eTypically 8-15 years in normal residential use. Heavy cycling, poor airflow, and dirty filters all shorten that.\u003c\/p\u003e\n\n\u003ch3\u003eWhat if it does not fit?\u003c\/h3\u003e\u003cp\u003eReturn it within 7 days of delivery. If you are unsure before ordering, call (888) 762-1334 — we are licensed HVAC contractors and can confirm the right part for your model.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSold by licensed HVAC contractors.\u003c\/strong\u003e Furnace Direct is Hamlin Mechanical LLC, Minnesota licence #128688. If this part does not fix the problem, call (888) 762-1334 and we will help you work out what will.\u003c\/p\u003e","brand":"RectorSeal","offers":[{"title":"Default Title","offer_id":58271395414319,"sku":"M39022","price":530.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/2111\/2367\/files\/M39022.jpg?v=1785719645"},{"product_id":"furnace-limit-switch-m39019","title":"Furnace Limit Switch | M39019","description":"\u003cp\u003e\u003cstrong\u003eFurnace Limit Switch\u003c\/strong\u003e — manufacturer part number \u003cstrong\u003eM39019\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat this part does\u003c\/h2\u003e\u003cp\u003eThe high limit switch shuts the burners down when the heat exchanger gets too hot. It is a safety device, so when it trips repeatedly the switch is usually doing its job correctly and the real fault is restricted airflow. Check the filter before you replace this.\u003c\/p\u003e\n\u003ch2\u003eReplace this part if\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFurnace heats briefly then shuts down, repeatedly\u003c\/li\u003e\n\u003cli\u003eBlower keeps running after the burners cut out\u003c\/li\u003e\n\u003cli\u003eFurnace locks out after several failed cycles\u003c\/li\u003e\n\u003cli\u003eSwitch reads open on a multimeter when cold\u003c\/li\u003e\n\u003cli\u003eBurnt or discoloured switch housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eM39019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eFurnace Direct (Hamlin Mechanical LLC, MN Lic. #128688)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eInstall difficulty\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eEasy\u003c\/strong\u003e — about 25 minutes. Tools: 1\/4\" nut driver, screwdriver. Power off at the breaker: yes. Gas shutoff required: no.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSafety warning:\u003c\/strong\u003e A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003cp\u003eTypical service life is 8-15 years.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I know if my furnace limit switch is bad?\u003c\/h3\u003e\u003cp\u003eReplace it if you see any of these: furnace heats briefly then shuts down, repeatedly; blower keeps running after the burners cut out; furnace locks out after several failed cycles.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a furnace limit switch myself?\u003c\/h3\u003e\u003cp\u003eYes. This is a easy repair that takes about 25 minutes with 1\/4\" nut driver, screwdriver. Always shut the power off at the breaker first. A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003ch3\u003eHow long does a furnace limit switch last?\u003c\/h3\u003e\u003cp\u003eTypically 8-15 years in normal residential use. Heavy cycling, poor airflow, and dirty filters all shorten that.\u003c\/p\u003e\n\n\u003ch3\u003eWhat if it does not fit?\u003c\/h3\u003e\u003cp\u003eReturn it within 7 days of delivery. If you are unsure before ordering, call (888) 762-1334 — we are licensed HVAC contractors and can confirm the right part for your model.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSold by licensed HVAC contractors.\u003c\/strong\u003e Furnace Direct is Hamlin Mechanical LLC, Minnesota licence #128688. If this part does not fix the problem, call (888) 762-1334 and we will help you work out what will.\u003c\/p\u003e","brand":"RectorSeal","offers":[{"title":"Default Title","offer_id":58271395447087,"sku":"M39019","price":530.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/2111\/2367\/files\/M39019.jpg?v=1785719647"},{"product_id":"furnace-limit-switch-l200","title":"Furnace Limit Switch | L200","description":"\u003cp\u003e\u003cstrong\u003eFurnace Limit Switch\u003c\/strong\u003e — manufacturer part number \u003cstrong\u003eL200\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat this part does\u003c\/h2\u003e\u003cp\u003eThe high limit switch shuts the burners down when the heat exchanger gets too hot. It is a safety device, so when it trips repeatedly the switch is usually doing its job correctly and the real fault is restricted airflow. Check the filter before you replace this.\u003c\/p\u003e\n\u003ch2\u003eReplace this part if\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFurnace heats briefly then shuts down, repeatedly\u003c\/li\u003e\n\u003cli\u003eBlower keeps running after the burners cut out\u003c\/li\u003e\n\u003cli\u003eFurnace locks out after several failed cycles\u003c\/li\u003e\n\u003cli\u003eSwitch reads open on a multimeter when cold\u003c\/li\u003e\n\u003cli\u003eBurnt or discoloured switch housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eL200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eFurnace Direct (Hamlin Mechanical LLC, MN Lic. #128688)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eInstall difficulty\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eEasy\u003c\/strong\u003e — about 25 minutes. Tools: 1\/4\" nut driver, screwdriver. Power off at the breaker: yes. Gas shutoff required: no.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSafety warning:\u003c\/strong\u003e A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003cp\u003eTypical service life is 8-15 years.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I know if my furnace limit switch is bad?\u003c\/h3\u003e\u003cp\u003eReplace it if you see any of these: furnace heats briefly then shuts down, repeatedly; blower keeps running after the burners cut out; furnace locks out after several failed cycles.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a furnace limit switch myself?\u003c\/h3\u003e\u003cp\u003eYes. This is a easy repair that takes about 25 minutes with 1\/4\" nut driver, screwdriver. Always shut the power off at the breaker first. A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003ch3\u003eHow long does a furnace limit switch last?\u003c\/h3\u003e\u003cp\u003eTypically 8-15 years in normal residential use. Heavy cycling, poor airflow, and dirty filters all shorten that.\u003c\/p\u003e\n\n\u003ch3\u003eWhat if it does not fit?\u003c\/h3\u003e\u003cp\u003eReturn it within 7 days of delivery. If you are unsure before ordering, call (888) 762-1334 — we are licensed HVAC contractors and can confirm the right part for your model.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSold by licensed HVAC contractors.\u003c\/strong\u003e Furnace Direct is Hamlin Mechanical LLC, Minnesota licence #128688. If this part does not fix the problem, call (888) 762-1334 and we will help you work out what will.\u003c\/p\u003e","brand":"Supco","offers":[{"title":"Default Title","offer_id":58271395545391,"sku":"L200","price":525.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/2111\/2367\/files\/L200.jpg?v=1785719648"},{"product_id":"furnace-limit-switch-hmr-130","title":"Furnace Limit Switch | HMR-130","description":"\u003cp\u003e\u003cstrong\u003eFurnace Limit Switch\u003c\/strong\u003e — manufacturer part number \u003cstrong\u003eHMR-130\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat this part does\u003c\/h2\u003e\u003cp\u003eThe high limit switch shuts the burners down when the heat exchanger gets too hot. It is a safety device, so when it trips repeatedly the switch is usually doing its job correctly and the real fault is restricted airflow. Check the filter before you replace this.\u003c\/p\u003e\n\u003ch2\u003eReplace this part if\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFurnace heats briefly then shuts down, repeatedly\u003c\/li\u003e\n\u003cli\u003eBlower keeps running after the burners cut out\u003c\/li\u003e\n\u003cli\u003eFurnace locks out after several failed cycles\u003c\/li\u003e\n\u003cli\u003eSwitch reads open on a multimeter when cold\u003c\/li\u003e\n\u003cli\u003eBurnt or discoloured switch housing\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eHMR-130\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCondition\u003c\/th\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSold By\u003c\/th\u003e\n\u003ctd\u003eFurnace Direct (Hamlin Mechanical LLC, MN Lic. #128688)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eInstall difficulty\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eEasy\u003c\/strong\u003e — about 25 minutes. Tools: 1\/4\" nut driver, screwdriver. Power off at the breaker: yes. Gas shutoff required: no.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSafety warning:\u003c\/strong\u003e A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003cp\u003eTypical service life is 8-15 years.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I know if my furnace limit switch is bad?\u003c\/h3\u003e\u003cp\u003eReplace it if you see any of these: furnace heats briefly then shuts down, repeatedly; blower keeps running after the burners cut out; furnace locks out after several failed cycles.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a furnace limit switch myself?\u003c\/h3\u003e\u003cp\u003eYes. This is a easy repair that takes about 25 minutes with 1\/4\" nut driver, screwdriver. Always shut the power off at the breaker first. A limit switch that trips repeatedly is a symptom, not the disease. Replace the filter and confirm airflow first. Never jumper a limit switch -- it is the device that stops a cracked heat exchanger becoming a fire.\u003c\/p\u003e\n\u003ch3\u003eHow long does a furnace limit switch last?\u003c\/h3\u003e\u003cp\u003eTypically 8-15 years in normal residential use. Heavy cycling, poor airflow, and dirty filters all shorten that.\u003c\/p\u003e\n\n\u003ch3\u003eWhat if it does not fit?\u003c\/h3\u003e\u003cp\u003eReturn it within 7 days of delivery. If you are unsure before ordering, call (888) 762-1334 — we are licensed HVAC contractors and can confirm the right part for your model.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSold by licensed HVAC contractors.\u003c\/strong\u003e Furnace Direct is Hamlin Mechanical LLC, Minnesota licence #128688. If this part does not fix the problem, call (888) 762-1334 and we will help you work out what will.\u003c\/p\u003e","brand":"DiversiTech","offers":[{"title":"Default Title","offer_id":58271395578159,"sku":"HMR-130","price":535.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/2111\/2367\/files\/HMR-130.jpg?v=1785719649"}],"url":"https:\/\/furnace.direct\/es\/collections\/limit-switches\/13-4-seer2+variable-speed.oembed","provider":"Furnace Direct","version":"1.0","type":"link"}