{"product_id":"dometic-refrigerator-thermistor-41-inch-lead","title":"Dometic Refrigerator Thermistor, 41 Inch Lead","description":"\u003cp class=\"nvn-hero\"\u003eWhen your Dometic fridge starts cycling wrong, running warm, or freezing everything solid, the thermistor is one of the first things to check. This is the genuine Dometic replacement temperature sensor with a 41 inch lead, long enough to route cleanly from the control board out to the cooling fin. Clip it on, plug it in, and your fridge reads temperature accurately again.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eThe thermistor is the little temperature sensor that tells your Dometic refrigerator's control board how cold the box actually is. It clips to the cooling fin inside the fresh food compartment, and its resistance changes as the temperature changes. The board reads that resistance and decides when to call for cooling. When the sensor drifts or quits, the board is flying blind. You end up with a fridge that runs warm, freezes the bottom shelf solid, or short cycles for no reason you can see.\u003c\/p\u003e\n\u003cp\u003eDometic builds this lead 41 inches long on purpose. That length gives you enough slack to route the wire from the control board, behind the liner, and out to the fin without splicing anything. On the RM series absorption fridges you'll find in a lot of boats and RVs, that reach matters. A short lead means splices, and splices sitting near a cold, damp evaporator are exactly where trouble tends to start.\u003c\/p\u003e\n\u003cp\u003eErratic cycling is the classic sign of a tired thermistor. One day the box is fine, the next it's warm up top and iced up down low. A common failure we see after a few seasons is moisture working its way into the connector, which throws the resistance readings off and makes the fridge cycle at random. If you've already confirmed your power is good and the cooling unit is sound, the sensor is the cheap part to rule out first.\u003c\/p\u003e\n\u003cp\u003eWho needs one of these? Usually it's the boater or RVer whose absorption fridge started acting up after a few seasons of vibration, heat, and humidity. Those conditions are hard on a small sensor and its connector. If your Dometic has been holding temperature poorly, cycling at odd times, or reading nothing like the actual box temperature, the thermistor is the sensible first move before you start chasing bigger, pricier parts.\u003c\/p\u003e\n\u003cp\u003eThe swap itself is straightforward. Kill power to the fridge first, either unplug it or pull the breaker. Take the old sensor off the fin, unplug it at the board, and route the new one along the same path. Here's the step that bites people: clip the probe tip snugly to the evaporator fin. A loose tip reads air temperature instead of fin temperature, and that alone can hand you 5 to 10 degree swings. A zip tie or the factory clip does the job. Plug it back in at the board, restore power, and let the box pull down.\u003c\/p\u003e\n\u003cp\u003eYou can test a thermistor before you swap it, since it's just a temperature-sensitive resistor. Pull the connector, set your meter to ohms, and read across the two leads. The resistance should be steady, and it should climb as the sensor gets colder. If it reads open, dead short, or bounces around when you wiggle the wire, it's finished. Near freezing a healthy fridge sensor reads somewhere in the neighborhood of 10k ohms, so a number way off from that is a good clue the part has failed.\u003c\/p\u003e\n\u003cp\u003eKnow what this part is and what it isn't. It's a genuine Dometic sensor, part number 38510590422, built for Dometic RM series refrigerators as a direct replacement for the original. It's not a controller and it's not a thermostat, and it won't revive a cooling unit that's lost its charge. If the box is warm because the cooling unit is dead, a new thermistor won't bring it back. But if the fridge cools fine and just can't hold a steady temperature, this is usually the fix.\u003c\/p\u003e\n\u003cp\u003eIf you're already pulling the fridge for compressor or cooling unit service, do yourself a favor and swap the thermistor while you're in there. It's a cheap part, and getting back to the sensor later means pulling panels all over again. We ship the genuine Dometic sensor with the full 41 inch reach and the correct connector, so it drops in where the original came out.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e41 inch lead routes from the control board out to the evaporator fin without splicing\u003c\/li\u003e\n  \u003cli\u003eGenuine Dometic replacement, MPN 38510590422, direct fit for RM series refrigerators\u003c\/li\u003e\n  \u003cli\u003eThermistor sensor feeds real box temperature to the control board for accurate cycling\u003c\/li\u003e\n  \u003cli\u003eClips to the cooling fin so it reads fin temperature, not drifting air temperature\u003c\/li\u003e\n  \u003cli\u003eSimple plug-in replacement at the control board, no controller reprogramming needed\u003c\/li\u003e\n  \u003cli\u003eTestable with a basic multimeter across the two leads before you commit to the swap\u003c\/li\u003e\n  \u003cli\u003eFixes the erratic cycling and warm-box symptoms of a failed original sensor\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Dometic reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know if my Dometic refrigerator thermistor is bad?\u003c\/summary\u003e\n    \u003cp\u003eThe usual tell is erratic cooling. The box runs warm, freezes on the bottom shelf, or cycles at random times. If your power checks out and the cooling unit is sound, a drifting or failed thermistor is the likely culprit. You can confirm it with a multimeter across the two leads.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I test the thermistor with a meter?\u003c\/summary\u003e\n    \u003cp\u003eUnplug the connector, set your meter to ohms, and read across the two leads. The resistance should be steady and should climb as the sensor gets colder. Near freezing a healthy fridge sensor reads in the neighborhood of 10k ohms. If it reads open, shorted, or jumps around when you wiggle the wire, replace it.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I replace the refrigerator thermistor?\u003c\/summary\u003e\n    \u003cp\u003eKill power to the fridge first, either unplug it or pull the breaker. Remove the old sensor from the cooling fin, unplug it at the control board, and route the new one along the same path. Clip the probe tip snugly to the fin, plug it back in at the board, and restore power.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat happens if I unplug the thermistor?\u003c\/summary\u003e\n    \u003cp\u003eThe control board loses its temperature reference. Without a valid reading it can't cycle the fridge correctly, so you'll typically see continuous running, no cooling, or a sensor fault depending on your control. The fridge needs a working thermistor to regulate temperature.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy is the lead 41 inches long?\u003c\/summary\u003e\n    \u003cp\u003eThe length lets you route the wire from the control board, behind the liner, and out to the cooling fin without splicing. On RM series fridges that reach matters, because splices near a cold, damp evaporator are a common source of trouble.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhere does the probe tip go?\u003c\/summary\u003e\n    \u003cp\u003eIt clips to the evaporator cooling fin inside the fresh food compartment. Secure it snugly, with a zip tie or the factory clip. A loose tip reads air temperature instead of fin temperature and can cause 5 to 10 degree swings.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill this fit my Dometic RM series fridge?\u003c\/summary\u003e\n    \u003cp\u003eYes. It's a genuine Dometic part, MPN 38510590422, built as a direct replacement for the original sensor on RM series refrigerators. Check your existing sensor's part number against 38510590422 to confirm.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill a new thermistor fix a fridge that won't get cold at all?\u003c\/summary\u003e\n    \u003cp\u003eNot if the cooling unit itself is dead. The thermistor only senses temperature, it doesn't produce cooling. If the box cools fine but can't hold a steady temperature or cycles oddly, the thermistor is usually the fix. If the box never gets cold, look at the cooling unit and power first.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need to reprogram anything after replacing it?\u003c\/summary\u003e\n    \u003cp\u003eNo. It's a direct plug-in replacement. Once the new sensor is clipped to the fin and plugged into the board, restore power and let the fridge pull down. There's no reprogramming step.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan moisture cause a thermistor to fail?\u003c\/summary\u003e\n    \u003cp\u003eYes. A common failure after a few seasons is moisture working into the connector, which skews the resistance readings and makes the fridge cycle at random. Routing the lead cleanly and seating the connector fully helps the replacement last.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eDometic Replacement Refrigerator Thermistor, 41 Inch Length\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eDometic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e38510590422\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e7315091124683\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eComponent Type\u003c\/th\u003e\n\u003ctd\u003eRefrigerator thermistor\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eLead Length\u003c\/th\u003e\n\u003ctd\u003e41 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSensor Type\u003c\/th\u003e\n\u003ctd\u003eThermistor (temperature-variable resistor)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eFunction\u003c\/th\u003e\n\u003ctd\u003eFeeds box temperature to the refrigerator control board\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003ctd\u003eDometic RM series refrigerators\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMounting\u003c\/th\u003e\n\u003ctd\u003eClips to the evaporator cooling fin\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProduct Line\u003c\/th\u003e\n\u003ctd\u003eS Thermistor Combo\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003eSingle replacement sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I know if my Dometic refrigerator thermistor is bad?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The usual tell is erratic cooling. The box runs warm, freezes on the bottom shelf, or cycles at random times. If your power checks out and the cooling unit is sound, a drifting or failed thermistor is the likely culprit. You can confirm it with a multimeter across the two leads.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I test the thermistor with a meter?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Unplug the connector, set your meter to ohms, and read across the two leads. The resistance should be steady and should climb as the sensor gets colder. Near freezing a healthy fridge sensor reads in the neighborhood of 10k ohms. If it reads open, shorted, or jumps around when you wiggle the wire, replace it.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I replace the refrigerator thermistor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Kill power to the fridge first, either unplug it or pull the breaker. Remove the old sensor from the cooling fin, unplug it at the control board, and route the new one along the same path. Clip the probe tip snugly to the fin, plug it back in at the board, and restore power.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What happens if I unplug the thermistor?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The control board loses its temperature reference. Without a valid reading it can't cycle the fridge correctly, so you'll typically see continuous running, no cooling, or a sensor fault depending on your control. The fridge needs a working thermistor to regulate temperature.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why is the lead 41 inches long?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The length lets you route the wire from the control board, behind the liner, and out to the cooling fin without splicing. On RM series fridges that reach matters, because splices near a cold, damp evaporator are a common source of trouble.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Where does the probe tip go?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It clips to the evaporator cooling fin inside the fresh food compartment. Secure it snugly, with a zip tie or the factory clip. A loose tip reads air temperature instead of fin temperature and can cause 5 to 10 degree swings.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will this fit my Dometic RM series fridge?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. It's a genuine Dometic part, MPN 38510590422, built as a direct replacement for the original sensor on RM series refrigerators. Check your existing sensor's part number against 38510590422 to confirm.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will a new thermistor fix a fridge that won't get cold at all?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Not if the cooling unit itself is dead. The thermistor only senses temperature, it doesn't produce cooling. If the box cools fine but can't hold a steady temperature or cycles oddly, the thermistor is usually the fix. If the box never gets cold, look at the cooling unit and power first.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do I need to reprogram anything after replacing it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. It's a direct plug-in replacement. Once the new sensor is clipped to the fin and plugged into the board, restore power and let the fridge pull down. There's no reprogramming step.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can moisture cause a thermistor to fail?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. A common failure after a few seasons is moisture working into the connector, which skews the resistance readings and makes the fridge cycle at random. Routing the lead cleanly and seating the connector fully helps the replacement last.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Dometic","offers":[{"title":"Default Title","offer_id":45066418356317,"sku":"2008869","price":66.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_54c7563b-bb2c-4df4-876b-90091cd575d9.png?v=1789638989","url":"https:\/\/nvnmarine.com\/products\/dometic-refrigerator-thermistor-41-inch-lead","provider":"NVN Marine","version":"1.0","type":"link"}