Dometic DFSD12121 Less-Door Furnace Parts Reference

The DFSD12121 is the less-door version of the 12K small-furnace family. Its source list includes vent panel parts and the extended manifold rather than the regular exterior access-door assemblies.

Match each drawing callout to the manufacturer number in the parts list. Select a linked number for product details and availability, and confirm the furnace model and serial-number range before ordering.

Parts pictured in this guide

Select an image for product details, or jump to the numbered diagram and parts list. Match the part number and furnace model before ordering.

Atwood 31501 12V DSI Furnace Ignition Board With Fan Control — DFSD12121 reference 4541Atwood 31501 12V DSI Furnace Ignition Board With Fan ControlPart 31501 · Drawing reference 4541
Atwood 31091 190°F RV Furnace High-Limit Safety Switch — DFSD12121 reference 4560Atwood 31091 190°F RV Furnace High-Limit Safety SwitchPart 31091 · Drawing reference 4560
Dometic 36688 Atwood 2-Inch RV Furnace Duct Adapter — DFSD12121 reference 4575Dometic 36688 Atwood 2-Inch RV Furnace Duct AdapterPart 36688 · Drawing reference 4575
Atwood 31474 Aluminum 4-Inch RV Furnace Duct Collar — DFSD12121 reference 4576Atwood 31474 Aluminum 4-Inch RV Furnace Duct CollarPart 31474 · Drawing reference 4576
Dometic 31361 4-Inch RV Furnace Duct Knockout Cover Plate — DFSD12121 reference 4577Dometic 31361 4-Inch RV Furnace Duct Knockout Cover PlatePart 31361 · Drawing reference 4577
Atwood 30268 LP-Gas Furnace Burner Head — DFSD12121 reference 4581Atwood 30268 LP-Gas Furnace Burner HeadPart 30268 · Drawing reference 4581
Dometic 32300 Black 12V Heat-Only RV Furnace Thermostat — DFSD12121 reference 4755Dometic 32300 Black 12V Heat-Only RV Furnace ThermostatPart 32300 · Drawing reference 4755
Dometic 38453 White HFH-2000 RV Furnace Thermostat — DFSD12121 reference 4757Dometic 38453 White HFH-2000 RV Furnace ThermostatPart 38453 · Drawing reference 4757
Dometic DFSD12 small Mohave furnace family service drawing accompanying DFSD12121 parts list
DFSD12-family reference image. Use the model-specific service numbers in the table.

Original DFSD12121 service part numbers

Drawing reference Manufacturer part number Quantity Component description
4503 30320 1 CIRCUIT BREAKER, 5 AMP
4510 35100 1 ELECTRODE
4516 31098 1 VALVE 12VDC TOP
4524 31093 1 SAIL SWITCH-WHITE - S# 72498929 & Below
4524 33063 1 SAIL SWITCH-DF-BLACK USE 33082
4524 33081 1 SAIL SWITCH - For S# After 72498929
4527 33065 1 SAIL SWITCH MOUNT
4541 31501 1 CIRCUIT BOARD
4550 30758 1 MOTOR S12-16
4560 31091 1 LIMIT SWITCH 190 DEG
4565 35712 1 MANIFOLD EXT ASSM
4573 35706 1 GAS LINE GROMMET
4575 36688 1 DUCT ADAPTER 2 INCH
4576 31474 1 DUCT ADAPTER 4 INCH
4577 31361 1 DUCT COVER PLATE 4 INCH
4579 31388 1 DUCT ADAPTER 5 INCH
4581 30268 1 BURNER HEAD, LP GAS
4583 32223 1 ADAPTER PLATE 5 INCH-4 INCH
4599 31086 1 ORIFICE #60 LP
4610 31244 1 CASING LEG
4626 31113 1 BLOWER WHEEL
4630 33128 1 COMBUSTION AIR WHEEL
4681 30456 1 VENT COVER PANEL USE 31367
4681 31367 1 VENT COVER PANEL V3-V4
4689 33055 1 VENT PANEL EXTENSION
4705 33050 1 DOOR VENT ASSEMBLY
4745 30260 1 FRONT GRILL-LD
4746 30259 1 FRONT GRILL-OD
4755 32300 1 WALL THERMOSTAT, HEAT ONLY BLACK
4756 38452 1 WALL THERMOSTAT, HEAT ONLY BROWN
4757 38453 1 WALL THERMOSTAT, HEAT ONLY WHITE
4846 30745 1 BLOWER HOUSING
4851 32446 1 BLOWER HOUSING COVER
4855 33060 1 WIRING HARNESS DC
4860 33168 1 EXHAUST ADAPTER .688
4868 33300 1 HEAT EXCHANGER SMALL

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