{"product_id":"dometic-freshjet-5-ac-control-board-4450037549","title":"Dometic FreshJet 5 Air Conditioner Electronic Control Board","description":"\u003cp class=\"nvn-hero\"\u003eWhen the brains of your Dometic FreshJet 5 give out, this is the part that brings it back to life. It's the genuine electronic control board, part 4450037549, built for the FreshJet 5 heat pump models FJX5557EHPWHCS and FJX5557EHPBKCS. Swap the board instead of the whole rooftop unit and you're back to cold air, and heat, for a fraction of the cost.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eEvery rooftop air conditioner has a brain, and on the Dometic FreshJet 5 that brain is this electronic control board. Part number 4450037549. It's the circuit board that takes shore power in, talks to your thermostat, and tells the compressor, fan motor, and heat pump when to fire. When it fails, the unit usually goes quiet or acts erratic even though everything else on the roof is fine. This board gets you running again without dropping the coin on a whole new air conditioner.\u003c\/p\u003e\n\u003cp\u003eIt's built specifically for the FreshJet 5 heat pump units, the white FJX5557EHPWHCS and the black FJX5557EHPBKCS. Those are the models Dometic positions as the direct upgrade from the older Penguin II, and they run the newer R32 refrigerant with a built-in hard start. This is the matching control board for that generation, so you're not guessing at compatibility or hunting for adapters that don't exist.\u003c\/p\u003e\n\u003cp\u003eWhat does the board actually do out there? It manages the startup sequence so the compressor doesn't slam on cold. It reads the call for cooling or heat from the thermostat and switches the heat pump over accordingly. It runs the blower speeds. And it handles the safety logic that shuts things down if something's out of range. On a FreshJet 5 the board pairs with the Dometic Connect Essential thermostat, and the two communicate over a simple RJ-style cable run. If your display has gone dark or the unit won't respond to the thermostat at all, a dead board is one of the first things to check.\u003c\/p\u003e\n\u003cp\u003eNot sure the board's the culprit? The usual tells are a unit that's completely unresponsive with good power at the plug, a thermostat that can't find the air conditioner, or a compressor and fan that never start even when the thermostat is calling for cooling. Those all point at the control side. A compressor that hums and trips, on the other hand, is more likely a hard-start or compressor issue than the board. Diagnose before you buy, and you'll only replace this part once.\u003c\/p\u003e\n\u003cp\u003eBoth ducted and non-ducted FreshJet 5 setups use this same board, so it doesn't matter whether your coach pushes air through ceiling ducts or blows it straight out of the ceiling assembly. The board's the same either way. What changes between installs is the plenum and the return, not the control electronics.\u003c\/p\u003e\n\u003cp\u003eWho's this for? Anybody whose FreshJet 5 has quit and traced the fault to the control board rather than the compressor or motor. That's a common outcome. Boards take the brunt of voltage spikes, moisture, and heat cycling, and they're a lot cheaper to swap than the sealed refrigeration side. If you're comfortable killing the breaker, getting up top, and working through a wiring harness, this is a very doable afternoon job. If you'd rather have a tech handle it, any RV or marine HVAC shop will know the FreshJet platform.\u003c\/p\u003e\n\u003cp\u003eA few install notes from experience. Kill the shore power and the breaker before you touch anything up top, and confirm it's dead. Photograph the existing harness before you unplug it so every connector goes back exactly where it came from. The board replacement doesn't open the sealed R32 refrigerant loop, so you don't need to recover refrigerant or call in a certified tech just to swap electronics. And take a second to check the connectors for corrosion while you're in there, because a green, crusty pin will kill a brand-new board just as fast as it killed the old one.\u003c\/p\u003e\n\u003cp\u003eOne thing to be clear about. This is the control board only. It's not the whole air conditioner, it's not the thermostat, and it's not a shroud or fan blade. If you need one of those, they're separate parts. But if the diagnosis points at the electronics, this is the exact Dometic board that belongs in a FreshJet 5, and it'll have you back to cold air, or heat, in short order.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003eGenuine Dometic electronic control board, part number 4450037549, an exact-fit replacement for the FreshJet 5\u003c\/li\u003e\n  \u003cli\u003eFits both FreshJet 5 heat pump units, the white FJX5557EHPWHCS and the black FJX5557EHPBKCS\u003c\/li\u003e\n  \u003cli\u003eManages compressor startup, fan speeds, and heat-pump switching so the unit runs the way it should\u003c\/li\u003e\n  \u003cli\u003eCommunicates with the Dometic Connect Essential thermostat over a standard RJ-style cable\u003c\/li\u003e\n  \u003cli\u003eWorks on both ducted and non-ducted FreshJet 5 installs, no separate board needed\u003c\/li\u003e\n  \u003cli\u003eBuilt for the R32 heat pump generation that replaced the Penguin II\u003c\/li\u003e\n  \u003cli\u003eSwaps in without opening the sealed refrigerant loop, so no refrigerant recovery is required\u003c\/li\u003e\n  \u003cli\u003eRestores a dead FreshJet 5 for far less than a full air conditioner replacement\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\u003eWhat does this Dometic control board do?\u003c\/summary\u003e\n    \u003cp\u003eIt's the electronic brain of the FreshJet 5. It takes in shore power, communicates with the thermostat, and controls the compressor, fan, and heat-pump functions, including the startup sequence and the safety shutoffs.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhich FreshJet 5 models does it fit?\u003c\/summary\u003e\n    \u003cp\u003eIt's built for the FreshJet 5 heat pump units, the white FJX5557EHPWHCS and the black FJX5557EHPBKCS. Those run R32 refrigerant with a built-in hard start.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this the whole air conditioner or just the board?\u003c\/summary\u003e\n    \u003cp\u003eJust the control board. It isn't the complete air conditioner, the thermostat, or a shroud. If the electronics are your problem, this is the part you need.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it support the heat pump function?\u003c\/summary\u003e\n    \u003cp\u003eYes. These FreshJet 5 models are heat-pump units, and the board runs the switching logic for both cooling and heat.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat thermostat works with it?\u003c\/summary\u003e\n    \u003cp\u003eThe FreshJet 5 pairs with the Dometic Connect Essential thermostat. The board and thermostat talk over a simple RJ-style cable run.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill it work on ducted and non-ducted setups?\u003c\/summary\u003e\n    \u003cp\u003eIt will. Both ducted and non-ducted FreshJet 5 installs use this same control board. Only the plenum and the return change between the two.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need to recover refrigerant to replace the board?\u003c\/summary\u003e\n    \u003cp\u003eNo. Swapping the control board doesn't open the sealed R32 loop, so there's no refrigerant recovery and no need for a certified refrigerant tech just to change the electronics.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I know my board has failed?\u003c\/summary\u003e\n    \u003cp\u003eThe common signs are a unit that's dead with good power at the plug, a thermostat that can't find the air conditioner, or a compressor and fan that never start on a call for cooling. Diagnose before you buy so you only replace it once.\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\u003eReplacement For Dometic Freshjet 5 Air Conditioner Model Numbers FJX5557EHPBKCS\/ FJX5557EHPWHCS\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\u003e4450037549\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e7333497000332\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePart Type\u003c\/th\u003e\n\u003ctd\u003eElectronic Control Board\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCompatible Series\u003c\/th\u003e\n\u003ctd\u003eDometic FreshJet 5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCompatible Model (White)\u003c\/th\u003e\n\u003ctd\u003eFJX5557EHPWHCS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCompatible Model (Black)\u003c\/th\u003e\n\u003ctd\u003eFJX5557EHPBKCS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCompatible Unit Type\u003c\/th\u003e\n\u003ctd\u003eRooftop Heat Pump Air Conditioner\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAC Configuration Supported\u003c\/th\u003e\n\u003ctd\u003eDucted or Non-Ducted\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCompatible Refrigerant System\u003c\/th\u003e\n\u003ctd\u003eR32\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eThermostat Compatibility\u003c\/th\u003e\n\u003ctd\u003eDometic Connect Essential\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eApplication\u003c\/th\u003e\n\u003ctd\u003eRV \/ Coach Rooftop Air Conditioner\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSold As\u003c\/th\u003e\n\u003ctd\u003eSingle Replacement Board\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\": \"What does this Dometic control board do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's the electronic brain of the FreshJet 5. It takes in shore power, communicates with the thermostat, and controls the compressor, fan, and heat-pump functions, including the startup sequence and the safety shutoffs.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Which FreshJet 5 models does it fit?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's built for the FreshJet 5 heat pump units, the white FJX5557EHPWHCS and the black FJX5557EHPBKCS. Those run R32 refrigerant with a built-in hard start.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this the whole air conditioner or just the board?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Just the control board. It isn't the complete air conditioner, the thermostat, or a shroud. If the electronics are your problem, this is the part you need.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it support the heat pump function?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. These FreshJet 5 models are heat-pump units, and the board runs the switching logic for both cooling and heat.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What thermostat works with it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The FreshJet 5 pairs with the Dometic Connect Essential thermostat. The board and thermostat talk over a simple RJ-style cable run.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will it work on ducted and non-ducted setups?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It will. Both ducted and non-ducted FreshJet 5 installs use this same control board. Only the plenum and the return change between the two.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do I need to recover refrigerant to replace the board?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. Swapping the control board doesn't open the sealed R32 loop, so there's no refrigerant recovery and no need for a certified refrigerant tech just to change the electronics.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How do I know my board has failed?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The common signs are a unit that's dead with good power at the plug, a thermostat that can't find the air conditioner, or a compressor and fan that never start on a call for cooling. Diagnose before you buy so you only replace it once.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Dometic","offers":[{"title":"Default Title","offer_id":45051811790941,"sku":"2008152","price":183.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_aadfd1b4-e510-400f-9c49-5271663d1767.jpg?v=1789403411","url":"https:\/\/nvnmarine.com\/products\/dometic-freshjet-5-ac-control-board-4450037549","provider":"NVN Marine","version":"1.0","type":"link"}