{"product_id":"dometic-dfldh40111-mojave-rv-furnace-40-000-btu-hall-effect","title":"Dometic DFLDH40111 Mojave RV Furnace | 40,000 BTU | Hall Effect","description":"\u003cp\u003eHeat your RV efficiently and quietly with the \u003cstrong\u003eDometic DFLDH40111 40,000 BTU Mojave Series RV Furnace\u003c\/strong\u003e — the \u003cstrong\u003eHall Effect sensor version\u003c\/strong\u003e of the proven DFLD40111 platform, with an \u003cstrong\u003eupdated control board designed around the Hall Effect air-prove circuit\u003c\/strong\u003e in place of the traditional sail switch. Compact, lightweight LP gas furnace built for larger RVs, fifth wheels, and toy haulers. Available at The RV Surplus.\u003c\/p\u003e\n\n\u003ch3\u003e⭐ What Makes The DFLDH40111 Different — Hall Effect Sensor\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e\"H\" in DFLDH40111\u003c\/strong\u003e denotes \u003cstrong\u003eHall Effect sensing\u003c\/strong\u003e in place of the mechanical sail switch used on earlier furnaces:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSail switch (older design):\u003c\/strong\u003e a physical paddle in the airstream closes a contact when airflow is strong enough. Can fail from dust buildup, bent paddles, worn contacts, or cold-weather sticking — one of the most common no-heat complaints.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHall Effect sensor (this furnace):\u003c\/strong\u003e solid-state magnetic sensing that detects blower-wheel rotation directly. No moving contacts in the airstream, nothing to gum up with dust, nothing to bend.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eUpdated control board\u003c\/strong\u003e is matched to the Hall Effect circuit — the furnace ships ready to run, no sail-switch retrofit or board swap required.\u003c\/p\u003e\n\n\u003ch3\u003e⚠️ Board + Sensor Matched Set — Not Interchangeable\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eDFLDH40111 control board and the Hall Effect sensor are a matched system\u003c\/strong\u003e. You cannot drop a Hall Effect sensor into an older sail-switch board, or run the new board with a sail switch. For replacement scenarios, decide which platform you're committing to \u003cstrong\u003ebefore\u003c\/strong\u003e ordering parts.\u003c\/p\u003e\n\n\u003ch3\u003e⭐ 40,000 BTU — Substantial Heating Capacity\u003c\/h3\u003e\n\u003cp\u003eThe DFLDH40111 delivers 40,000 BTU of heating output — appropriate for:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLarger fifth wheels and toy haulers with serious heating demand\u003c\/li\u003e\n  \u003cli\u003eClass A motorhomes with substantial interior volume\u003c\/li\u003e\n  \u003cli\u003eRVs in cold climates where heating capacity matters\u003c\/li\u003e\n  \u003cli\u003eSetups with multiple slide-outs that add cabin space requiring heat\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e⭐ Tubular Pipe Heat Exchanger — Quieter, Smoother Airflow\u003c\/h3\u003e\n\u003cp\u003eDometic's standout engineering feature is the \u003cstrong\u003etubular pipe design heat exchanger with smooth, rounded bends\u003c\/strong\u003e. Compared to conventional sharp-cornered designs:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAir flows and heats more evenly through the rounded pipe geometry\u003c\/li\u003e\n  \u003cli\u003eAir doesn't get \"trapped\" or slowed in sharp corners\u003c\/li\u003e\n  \u003cli\u003eLess turbulence means \u003cstrong\u003emeaningfully quieter operation\u003c\/strong\u003e — a real comfort improvement when you're trying to sleep with the furnace cycling\u003c\/li\u003e\n  \u003cli\u003eMaximum airflow at a given fan speed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e⭐ Up to 9 Duct Configurations — Most in the Industry\u003c\/h3\u003e\n\u003cp\u003eThe DFLDH40111 offers up to \u003cstrong\u003e9 possible duct configurations\u003c\/strong\u003e — the most flexibility on the market for distributing heat throughout your RV. Whether your installation needs ductwork running forward, aft, side-to-side, or some combination, the DFLDH40111 likely supports the configuration you need without compromise.\u003c\/p\u003e\n\n\u003ch3\u003e⭐ Horizontal OR Vertical Installation\u003c\/h3\u003e\n\u003cp\u003eThe compact low-profile design installs in \u003cstrong\u003eeither horizontal or vertical orientation\u003c\/strong\u003e — adapting to existing space constraints in different RV layouts. That installation flexibility means the furnace can fit installations where a single-orientation furnace wouldn't.\u003c\/p\u003e\n\n\u003ch3\u003e⚠️ Access Door SOLD SEPARATELY — Required for Installation\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eexterior access door is NOT included\u003c\/strong\u003e with this furnace and is required for installation. The matching access door is \u003cstrong\u003eDometic part #33058\u003c\/strong\u003e, sold separately.\u003c\/p\u003e\n\u003cp\u003eImportant notes for replacement scenarios:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIf you're replacing an older \u003cstrong\u003eAF model\u003c\/strong\u003e (e.g., AFLD40111, AFLD40131) with this newer DF model, you MUST replace the access door — the old AF door is not compatible\u003c\/li\u003e\n  \u003cli\u003eIf you're replacing a \u003cstrong\u003eDF or DFLD model\u003c\/strong\u003e with this DFLDH model, you can typically reuse your existing access door\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e⭐ Wide Direct-Replacement Coverage\u003c\/h3\u003e\n\u003cp\u003eThe DFLDH40111 is a replacement platform for the same range of older Atwood\/Dometic furnaces covered by the DFLD40111 — now with Hall Effect sensing instead of a sail switch. Cross-reference: if your existing furnace has any of these part numbers, this is a candidate replacement:\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eOlder item numbers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e8940DC, 32659, 32661, 32803, 32806, 35600, 38351\u003c\/li\u003e\n  \u003cli\u003e32803SU, 32806SU, 35600SU\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eOlder model numbers:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAFLD40111, AFLD40131, DFLD40131 (BP, SP, or SU variants)\u003c\/li\u003e\n  \u003cli\u003eDFLD40111 (sail-switch predecessor to this Hall Effect version)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e⚠️ This furnace may not be a \"direct\" replacement in all cases.\u003c\/strong\u003e Depending on your specific RV application and existing furnace model, modifications may be required to install this furnace.\u003c\/p\u003e\n\n\u003ch3\u003e⭐ Electric Ignition + 12V DC Operation\u003c\/h3\u003e\n\u003cp\u003eThe DFLDH40111 uses electric ignition for reliable starts without manual lighting. The furnace itself runs on 12V DC power from your RV electrical system (12.5 amp draw during operation) and burns LP propane as the heat source.\u003c\/p\u003e\n\n\u003ch3\u003e⚠️ Before Calling It a Furnace Failure\u003c\/h3\u003e\n\u003cp\u003eIf a furnace won't fire, Hall Effect sensing eliminates one major failure mode (the sail switch), but other faults still happen. Work through:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLP gas supply\u003c\/strong\u003e — tank valve open, regulator working, lines bled of air\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e12V battery voltage AT the furnace\u003c\/strong\u003e — not just at the battery (long wire runs cause drop)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThermostat calling for heat\u003c\/strong\u003e — verify with a jumper at the furnace terminals if in doubt\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReturn air blockage\u003c\/strong\u003e — the blower must reach full speed for the Hall Effect sensor to prove airflow\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExterior vents clear\u003c\/strong\u003e — wasps, spider webs, and debris block combustion and exhaust\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlower wheel free and balanced\u003c\/strong\u003e — Hall Effect senses rotation; a dragging bearing or broken wheel reads as \"no airflow proven\"\u003c\/li\u003e\n  \u003cli\u003eListen for the \u003cstrong\u003esequence of events on a call for heat\u003c\/strong\u003e: fan starts → Hall Effect proves rotation → gas valve opens → spark → flame → steady run. Where it stops narrows the fault.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e⚠️ Professional Installation Recommended\u003c\/h3\u003e\n\u003cp\u003eFurnace installation involves propane connections, ducting, exhaust venting, and electrical work. \u003cstrong\u003eImproperly installed gas furnaces are a serious fire, carbon monoxide, and safety risk.\u003c\/strong\u003e Installation should be performed by a qualified RV service technician. Always leak-test propane connections after installation and verify proper exhaust venting.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e(1) DFLDH40111 Furnace with Hall Effect sensor and updated control board\u003c\/li\u003e\n  \u003cli\u003e(2) Mounting Brackets\u003c\/li\u003e\n  \u003cli\u003e(2 to 4) Duct Adapters (quantity depends on configuration)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSold Separately — REQUIRED\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAccess Door (Dometic #33058) — required for installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cstrong\u003eHall Effect airflow sensor (replaces sail switch)\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eUpdated control board matched to Hall Effect sensing\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e40,000 BTU heating capacity — substantial output for larger RVs\u003c\/li\u003e\n  \u003cli\u003eDometic Mojave Series tubular pipe heat exchanger design\u003c\/li\u003e\n  \u003cli\u003eQuieter operation via reduced air turbulence\u003c\/li\u003e\n  \u003cli\u003eUp to 9 duct configurations — most in the industry\u003c\/li\u003e\n  \u003cli\u003eHorizontal OR vertical installation\u003c\/li\u003e\n  \u003cli\u003eLow-profile compact design\u003c\/li\u003e\n  \u003cli\u003eElectric ignition\u003c\/li\u003e\n  \u003cli\u003eLP gas heat source\u003c\/li\u003e\n  \u003cli\u003e12V DC operation, 12.5 amp draw\u003c\/li\u003e\n  \u003cli\u003eDucted circulation\u003c\/li\u003e\n  \u003cli\u003eDoored (exterior access) — door sold separately (#33058)\u003c\/li\u003e\n  \u003cli\u003eCompact dimensions (w\/o door): 16-1\/2\" W × 9\" H × 20\" D\u003c\/li\u003e\n  \u003cli\u003eWeight: 39 lbs\u003c\/li\u003e\n  \u003cli\u003eBacked by a limited 2-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eBrand: Dometic\u003c\/li\u003e\n  \u003cli\u003eSeries: Mojave\u003c\/li\u003e\n  \u003cli\u003eModel: DFLDH40111\u003c\/li\u003e\n  \u003cli\u003eType: RV Furnace\u003c\/li\u003e\n  \u003cli\u003eAirflow Sensing: Hall Effect (updated vs sail-switch DFLD40111)\u003c\/li\u003e\n  \u003cli\u003eControl Board: Updated — matched to Hall Effect sensor\u003c\/li\u003e\n  \u003cli\u003eBTU Output: 40,000 BTU\u003c\/li\u003e\n  \u003cli\u003eHeat Source: LP gas (propane)\u003c\/li\u003e\n  \u003cli\u003eIgnition: Electric\u003c\/li\u003e\n  \u003cli\u003ePower: 12V DC\u003c\/li\u003e\n  \u003cli\u003eCurrent Draw: 12.5 amps\u003c\/li\u003e\n  \u003cli\u003eCirculation: Ducted\u003c\/li\u003e\n  \u003cli\u003eDuct Configurations: Up to 9 possible\u003c\/li\u003e\n  \u003cli\u003eInstallation Orientation: Horizontal OR vertical\u003c\/li\u003e\n  \u003cli\u003eFurnace Access: Doored (exterior access)\u003c\/li\u003e\n  \u003cli\u003eAccess Door: NOT INCLUDED (Dometic #33058, sold separately, required for installation)\u003c\/li\u003e\n  \u003cli\u003eFurnace Dimensions (w\/o door): 16-1\/2\" W × 9\" H × 20\" D\u003c\/li\u003e\n  \u003cli\u003eWeight: 39 lbs\u003c\/li\u003e\n  \u003cli\u003eReplaces (older models — verify fitment): 8940DC, 32659, 32661, 32803, 32806, 35600, 38351, 32803SU, 32806SU, 35600SU, AFLD40111, AFLD40131, DFLD40111, DFLD40131 (BP\/SP\/SU)\u003c\/li\u003e\n  \u003cli\u003eReturn Policy: 30 days after delivery\u003c\/li\u003e\n  \u003cli\u003eSpecial Order: No\u003c\/li\u003e\n  \u003cli\u003eWarranty: Limited 2-year manufacturer warranty\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Dometic","offers":[{"title":"Default Title","offer_id":58822228934959,"sku":null,"price":1199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/7663\/0063\/files\/Dometic_DFLD40111_01.webp?v=1794336606","url":"https:\/\/thervsurplus.com\/products\/dometic-dfldh40111-mojave-rv-furnace-40-000-btu-hall-effect","provider":"The RV Surplus LLC","version":"1.0","type":"link"}