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.
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 |