Dometic DFLDH40111 Mojave RV Furnace | 40,000 BTU | Hall Effect

Heat your RV efficiently and quietly with the Dometic DFLDH40111 40,000 BTU Mojave Series RV Furnace — the Hall Effect sensor version of the proven DFLD40111 platform, with an updated control board designed around the Hall Effect air-prove circuit 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.

⭐ What Makes The DFLDH40111 Different — Hall Effect Sensor

The "H" in DFLDH40111 denotes Hall Effect sensing in place of the mechanical sail switch used on earlier furnaces:

• Sail switch (older design): 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.
• Hall Effect sensor (this furnace): 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.

Updated control board is matched to the Hall Effect circuit — the furnace ships ready to run, no sail-switch retrofit or board swap required.

⚠️ Board + Sensor Matched Set — Not Interchangeable

The DFLDH40111 control board and the Hall Effect sensor are a matched system. 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 before ordering parts.

⭐ 40,000 BTU — Substantial Heating Capacity

The DFLDH40111 delivers 40,000 BTU of heating output — appropriate for:

• Larger fifth wheels and toy haulers with serious heating demand
• Class A motorhomes with substantial interior volume
• RVs in cold climates where heating capacity matters
• Setups with multiple slide-outs that add cabin space requiring heat

⭐ Tubular Pipe Heat Exchanger — Quieter, Smoother Airflow

Dometic's standout engineering feature is the tubular pipe design heat exchanger with smooth, rounded bends. Compared to conventional sharp-cornered designs:

• Air flows and heats more evenly through the rounded pipe geometry
• Air doesn't get "trapped" or slowed in sharp corners
• Less turbulence means meaningfully quieter operation — a real comfort improvement when you're trying to sleep with the furnace cycling
• Maximum airflow at a given fan speed

⭐ Up to 9 Duct Configurations — Most in the Industry

The DFLDH40111 offers up to 9 possible duct configurations — 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.

⭐ Horizontal OR Vertical Installation

The compact low-profile design installs in either horizontal or vertical orientation — 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.

⚠️ Access Door SOLD SEPARATELY — Required for Installation

The exterior access door is NOT included with this furnace and is required for installation. The matching access door is Dometic part #33058, sold separately.

Important notes for replacement scenarios:

• If you're replacing an older AF model (e.g., AFLD40111, AFLD40131) with this newer DF model, you MUST replace the access door — the old AF door is not compatible
• If you're replacing a DF or DFLD model with this DFLDH model, you can typically reuse your existing access door

⭐ Wide Direct-Replacement Coverage

The 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:

Older item numbers:

• 8940DC, 32659, 32661, 32803, 32806, 35600, 38351
• 32803SU, 32806SU, 35600SU

Older model numbers:

• AFLD40111, AFLD40131, DFLD40131 (BP, SP, or SU variants)
• DFLD40111 (sail-switch predecessor to this Hall Effect version)

⚠️ This furnace may not be a "direct" replacement in all cases. Depending on your specific RV application and existing furnace model, modifications may be required to install this furnace.

⭐ Electric Ignition + 12V DC Operation

The 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.

⚠️ Before Calling It a Furnace Failure

If a furnace won't fire, Hall Effect sensing eliminates one major failure mode (the sail switch), but other faults still happen. Work through:

• LP gas supply — tank valve open, regulator working, lines bled of air
• 12V battery voltage AT the furnace — not just at the battery (long wire runs cause drop)
• Thermostat calling for heat — verify with a jumper at the furnace terminals if in doubt
• Return air blockage — the blower must reach full speed for the Hall Effect sensor to prove airflow
• Exterior vents clear — wasps, spider webs, and debris block combustion and exhaust
• Blower wheel free and balanced — Hall Effect senses rotation; a dragging bearing or broken wheel reads as "no airflow proven"
• Listen for the sequence of events on a call for heat: fan starts → Hall Effect proves rotation → gas valve opens → spark → flame → steady run. Where it stops narrows the fault.

⚠️ Professional Installation Recommended

Furnace installation involves propane connections, ducting, exhaust venting, and electrical work. Improperly installed gas furnaces are a serious fire, carbon monoxide, and safety risk. Installation should be performed by a qualified RV service technician. Always leak-test propane connections after installation and verify proper exhaust venting.

What's Included

• (1) DFLDH40111 Furnace with Hall Effect sensor and updated control board
• (2) Mounting Brackets
• (2 to 4) Duct Adapters (quantity depends on configuration)

Sold Separately — REQUIRED

• Access Door (Dometic #33058) — required for installation

Key Features

• Hall Effect airflow sensor (replaces sail switch)
• Updated control board matched to Hall Effect sensing
• 40,000 BTU heating capacity — substantial output for larger RVs
• Dometic Mojave Series tubular pipe heat exchanger design
• Quieter operation via reduced air turbulence
• Up to 9 duct configurations — most in the industry
• Horizontal OR vertical installation
• Low-profile compact design
• Electric ignition
• LP gas heat source
• 12V DC operation, 12.5 amp draw
• Ducted circulation
• Doored (exterior access) — door sold separately (#33058)
• Compact dimensions (w/o door): 16-1/2" W × 9" H × 20" D
• Weight: 39 lbs
• Backed by a limited 2-year manufacturer warranty

Specifications

• Brand: Dometic
• Series: Mojave
• Model: DFLDH40111
• Type: RV Furnace
• Airflow Sensing: Hall Effect (updated vs sail-switch DFLD40111)
• Control Board: Updated — matched to Hall Effect sensor
• BTU Output: 40,000 BTU
• Heat Source: LP gas (propane)
• Ignition: Electric
• Power: 12V DC
• Current Draw: 12.5 amps
• Circulation: Ducted
• Duct Configurations: Up to 9 possible
• Installation Orientation: Horizontal OR vertical
• Furnace Access: Doored (exterior access)
• Access Door: NOT INCLUDED (Dometic #33058, sold separately, required for installation)
• Furnace Dimensions (w/o door): 16-1/2" W × 9" H × 20" D
• Weight: 39 lbs
• Replaces (older models — verify fitment): 8940DC, 32659, 32661, 32803, 32806, 35600, 38351, 32803SU, 32806SU, 35600SU, AFLD40111, AFLD40131, DFLD40111, DFLD40131 (BP/SP/SU)
• Return Policy: 30 days after delivery
• Special Order: No
• Warranty: Limited 2-year manufacturer warranty