{"title":"Thermocouples","description":"\u003cp\u003eThe thermocouple holds the pilot valve open on a standing-pilot furnace, boiler or water heater. It generates a few millivolts from the pilot flame; when it weakens, the safety drops out.\u003c\/p\u003e\u003cp\u003eSymptom: the pilot lights while you hold the button and goes out the moment you let go. Match the length and the connection type.\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":"thermocouple-q340a1090-u","title":"Thermocouple | Q340A1090\/U","description":"\u003cp\u003e\u003cstrong\u003eThermocouple\u003c\/strong\u003e — manufacturer part number \u003cstrong\u003eQ340A1090\/U\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat this part does\u003c\/h2\u003e\u003cp\u003eThe thermocouple sits in the standing pilot flame and generates a small voltage that holds the gas valve's safety open. When it weakens, the valve can no longer stay open and the pilot drops out as soon as you release the button.\u003c\/p\u003e\n\u003ch2\u003eReplace this part if\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePilot lights but goes out when you release the control knob\u003c\/li\u003e\n\u003cli\u003ePilot will not stay lit at all\u003c\/li\u003e\n\u003cli\u003ePilot burns yellow or weak rather than blue\u003c\/li\u003e\n\u003cli\u003eThermocouple tip is corroded, sooty, or pitted\u003c\/li\u003e\n\u003cli\u003eNo heat despite a lit pilot\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\u003eQ340A1090\/U\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 20 minutes. Tools: Adjustable wrench, 3\/8\" wrench. Power off at the breaker: yes. Gas shutoff required: no.\u003c\/p\u003e\n\u003cp\u003eTypical service life is 3-6 years.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I know if my thermocouple is bad?\u003c\/h3\u003e\u003cp\u003eReplace it if you see any of these: pilot lights but goes out when you release the control knob; pilot will not stay lit at all; pilot burns yellow or weak rather than blue.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a thermocouple myself?\u003c\/h3\u003e\u003cp\u003eYes. This is a easy repair that takes about 20 minutes with adjustable wrench, 3\/8\" wrench. Always shut the power off at the breaker first.\u003c\/p\u003e\n\u003ch3\u003eHow long does a thermocouple last?\u003c\/h3\u003e\u003cp\u003eTypically 3-6 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":"Resideo","offers":[{"title":"Default Title","offer_id":58271381225775,"sku":"Q340A1090\/U","price":40.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/2111\/2367\/files\/Q340A1090-U.jpg?v=1785719563"},{"product_id":"thermocouple-q340a1082-u","title":"Thermocouple | Q340A1082\/U","description":"\u003cp\u003e\u003cstrong\u003eThermocouple\u003c\/strong\u003e — manufacturer part number \u003cstrong\u003eQ340A1082\/U\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat this part does\u003c\/h2\u003e\u003cp\u003eThe thermocouple sits in the standing pilot flame and generates a small voltage that holds the gas valve's safety open. When it weakens, the valve can no longer stay open and the pilot drops out as soon as you release the button.\u003c\/p\u003e\n\u003ch2\u003eReplace this part if\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePilot lights but goes out when you release the control knob\u003c\/li\u003e\n\u003cli\u003ePilot will not stay lit at all\u003c\/li\u003e\n\u003cli\u003ePilot burns yellow or weak rather than blue\u003c\/li\u003e\n\u003cli\u003eThermocouple tip is corroded, sooty, or pitted\u003c\/li\u003e\n\u003cli\u003eNo heat despite a lit pilot\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\u003eQ340A1082\/U\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 20 minutes. Tools: Adjustable wrench, 3\/8\" wrench. Power off at the breaker: yes. Gas shutoff required: no.\u003c\/p\u003e\n\u003cp\u003eTypical service life is 3-6 years.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I know if my thermocouple is bad?\u003c\/h3\u003e\u003cp\u003eReplace it if you see any of these: pilot lights but goes out when you release the control knob; pilot will not stay lit at all; pilot burns yellow or weak rather than blue.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a thermocouple myself?\u003c\/h3\u003e\u003cp\u003eYes. This is a easy repair that takes about 20 minutes with adjustable wrench, 3\/8\" wrench. Always shut the power off at the breaker first.\u003c\/p\u003e\n\u003ch3\u003eHow long does a thermocouple last?\u003c\/h3\u003e\u003cp\u003eTypically 3-6 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":"Resideo","offers":[{"title":"Default Title","offer_id":58271381258543,"sku":"Q340A1082\/U","price":38.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/2111\/2367\/files\/Q340A1082-U.jpg?v=1785719564"},{"product_id":"thermocouple-q340a1074-u","title":"Thermocouple | Q340A1074\/U","description":"\u003cp\u003e\u003cstrong\u003eThermocouple\u003c\/strong\u003e — manufacturer part number \u003cstrong\u003eQ340A1074\/U\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eWhat this part does\u003c\/h2\u003e\u003cp\u003eThe thermocouple sits in the standing pilot flame and generates a small voltage that holds the gas valve's safety open. When it weakens, the valve can no longer stay open and the pilot drops out as soon as you release the button.\u003c\/p\u003e\n\u003ch2\u003eReplace this part if\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePilot lights but goes out when you release the control knob\u003c\/li\u003e\n\u003cli\u003ePilot will not stay lit at all\u003c\/li\u003e\n\u003cli\u003ePilot burns yellow or weak rather than blue\u003c\/li\u003e\n\u003cli\u003eThermocouple tip is corroded, sooty, or pitted\u003c\/li\u003e\n\u003cli\u003eNo heat despite a lit pilot\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\u003eQ340A1074\/U\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 20 minutes. Tools: Adjustable wrench, 3\/8\" wrench. Power off at the breaker: yes. Gas shutoff required: no.\u003c\/p\u003e\n\u003cp\u003eTypical service life is 3-6 years.\u003c\/p\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eHow do I know if my thermocouple is bad?\u003c\/h3\u003e\u003cp\u003eReplace it if you see any of these: pilot lights but goes out when you release the control knob; pilot will not stay lit at all; pilot burns yellow or weak rather than blue.\u003c\/p\u003e\n\u003ch3\u003eCan I replace a thermocouple myself?\u003c\/h3\u003e\u003cp\u003eYes. This is a easy repair that takes about 20 minutes with adjustable wrench, 3\/8\" wrench. Always shut the power off at the breaker first.\u003c\/p\u003e\n\u003ch3\u003eHow long does a thermocouple last?\u003c\/h3\u003e\u003cp\u003eTypically 3-6 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":"Resideo","offers":[{"title":"Default Title","offer_id":58271381291311,"sku":"Q340A1074\/U","price":36.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0955\/2111\/2367\/files\/Q340A1074-U.jpg?v=1785719565"}],"url":"https:\/\/furnace.direct\/collections\/thermocouples\/15-seer2+18-seer2.oembed","provider":"Furnace Direct","version":"1.0","type":"link"}