Atwood AFSD12121 — 12,000 BTU/hr input, small-vent, less-door. This small-cabinet AFSD12 version uses the less-door vent arrangement. The illustrated reference distinguishes its front grille, vent extensions and manifold from the conventional furnace-door configuration.
The historical list has multiple vent revisions. Select vent and panel parts only after checking the installed revision and Atwood service chart. Match the full furnace identification plate, serial number, gas fitting and original component markings before ordering. The numbered rows are historical service references, not a guarantee of current availability or a serial-range compatibility declaration.
AFSD12121 exploded furnace diagram
| Reference | Manufacturer part number | Quantity | Historical part description |
|---|---|---|---|
| 1 | 30320 | 1 | CIRCUIT BREAKER, 5 AMP |
| 3 | 30260 | 1 | FRONT GRILL KIT, LESS DOOR |
| 6 | 36688 | 1 | DUCT ADAPTER 2 INCH |
| 7 | 31474 | 1 | DUCT ADAPTER 4 INCH |
| 8 | 31361 | 1 | DUCT COVER PLATE, 4 INCH |
| 9 | 35100 | 1 | ELECTRODE ASM. SMALL |
| 10 | 35711 | 1 | HEAT EXCHANGER, SMALL |
| 11 | 31244 | 1 | CASING LEG |
| 12 | 35706 | 1 | GAS LINE GROMMET |
| 13 | 30197 | 1 | VENT COVER PANEL SM V2-W |
| 13 | 30456 | 1 | VENT PANEL EXTENSION SML V3 |
| 14 | 31501 | 1 | ELECTRONIC IGNITION BOARD |
| 14 | 32353 | 1 | UNIVERSAL IGNITION DC SMT |
| 15 | 35712 | 1 | MANIFOLD EXT ASM KIT, SML |
| NS | 32349 | 1 | MANIFOLD, INLET SMALL |
| 16 | 30758 | 1 | MOTOR, S12-16 |
| 17 | 31086 | 1 | ORIFICE #60 LP |
| 18 | 31091 | 1 | LIMIT SWITCH, 190 DEGREE |
| 19 | 31093 | 1 | SAIL SWITCH, SMALL-WHITE - Serial# 724xxxxx and Lower |
| 19 | 33063 | 1 | SAIL SWITCH DF-BLACK - NLA - Serial# 724xxxxx and Higher |
| 20 | 32300 | 1 | THERMOSTAT, HEAT ONLY, BLACK |
| 20 | 38452 | 1 | T-STAT HEAT ONLY - BROWN |
| 20 | 38453 | 1 | THERMOSTAT HEAT ONLY- WHITE |
| 21 | 31098 | 1 | VALVE 12VDC TOP SMALL |
| 21 | 31096 | 1 | VALVE KIT, 12VDC -V1 SML |
| 22 | 30268 | 1 | BURNER HEAD, LP GAS |
| 26 | 30579 | 1 | VENT KIT, LD .688 V3 — historical vent variant; callout/fitment requires manufacturer revision confirmation |
| 26 | 30992 | 1 | VENT KIT, LD .688 V4 — historical vent variant; callout/fitment requires manufacturer revision confirmation |
| 27 | 32311 | 1 | VENT KIT, LD .688 V4 SW — historical vent variant; callout/fitment requires manufacturer revision confirmation |
| 28 | 30611 | 1 | VENT PANEL EXTENSION SML V4 |
| 29 | 31113 | 1 | BLOWER WHEEL, SMALL |
| 30 | 33128 | 1 | COMBUSTION AIR WHEEL |
| 33 | 30457 | 1 | VENT PANEL EXTENSION SML V3 |
| 34 | 31114 | 1 | WIRING HARNESS, DC |
| NS | 31923 | 1 | VENT PANEL EXTENSION SM V1 |
Replacement parts pictured at NewRVParts
These product listings match manufacturer numbers linked in the parts diagram. Confirm the exact furnace model, serial range and component version before ordering. Current availability appears on the product listing.
Diagram ref 6 · MPN 36688
Dometic 36688 Atwood 2-Inch RV Furnace Duct Adapter
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Diagram ref 7 · MPN 31474
Atwood 31474 Aluminum 4-Inch RV Furnace Duct Collar
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Diagram ref 8 · MPN 31361
Dometic 31361 4-Inch RV Furnace Duct Knockout Cover Plate
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Diagram ref 9 · MPN 35100
Atwood / Dometic 35100 Small Furnace Ignition Electrode Kit - AFMD
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Diagram ref 14 · MPN 31501
Atwood 31501 12V DSI Furnace Ignition Board With Fan Control
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Diagram ref 18 · MPN 31091
Atwood 31091 190°F RV Furnace High-Limit Safety Switch
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Diagram ref 20 · MPN 32300
Dometic 32300 Black 12V Heat-Only RV Furnace Thermostat
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Diagram ref 20 · MPN 38453
Dometic 38453 White HFH-2000 RV Furnace Thermostat
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Diagram ref 22 · MPN 30268
Atwood 30268 LP-Gas Furnace Burner Head
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Diagram ref 30 · MPN 33128
Dometic 33128 Atwood RV Furnace Combustion Wheel Kit
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Diagram ref 34 · MPN 31114
Dometic 31114 DC Wiring Harness for Atwood AFMD Furnaces
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