The 4002K is a manually opening MAXXFAN Plus roof vent, but its electronic board is not the same as the 4000K. This reference follows the original MaxxAir control-plate and base exploded drawings, showing the small service parts around the screen, lid linkage and fan motor.
Original manufacturer parts illustrations
Find the original callout in the manufacturer's drawing, then use the table below to identify its part number. Open the PDF to view small details at full size.
Control plate and electronic switches
Fan base, lift and motor components
Parts by diagram number
These are the exact part references shown for this model or assembly in the manufacturer's service chart. Product links are included where NewRVParts carries the matching numbered item.
| Callout | Part no. | Assembly or function | Product |
|---|---|---|---|
| 2M | 10B21274K | Model-specific PCB for 4002K | |
| 1 | 05-20226K | Interior control plate | View item |
| 3M | 10-21232K | Manual lid-lock knob shaft | |
| 4M | 05-21236K | Manual roof-lid knob | |
| 5 | 10-21299K | User keypad for 4000K / 4002K | View item |
| 6M | 10-21241K | Manual lid-knob screw | |
| 7 | 05-21233 | Interior screen retainers (four) | |
| 8 | 05-30925 | Round interior fan screen | View item |
| 9 | 10-20258KS | Ventilation fan blade | View item |
| 10 | 10A40012K | Roof-vent base; not offered separately by maker | |
| 11 | 10-20233K | Base rubber seal | |
| 12 | 10-20287 | Lid-arm bushings (three) | |
| 13 | 10-20222KS | Lid-lifter arm | View item |
| 14 | 10-20968 | Fan motor for fans produced after February 2012 | View item |
| 16M | 10A20281K-3CF | Manual roof-lid operator | |
| 18 | 10-40003K | Lid hinge pin | |
| Lid | 12-00056 | White MAXXFAN Plus lid assembly | View item |
| Lid | 12-00057 | Smoke MAXXFAN Plus lid assembly | |
| Lid | 12-00075 | Clear MAXXFAN Plus lid assembly | |
| Lid | 12-00076 | Tint MAXXFAN Plus lid assembly |
Related parts and product photographs
The product images below come from current NewRVParts listings. Use the manufacturer number and the complete model information to check each part before buying.
Match the correct model and revision
Airxcel's repair table identifies 10B21274K as the 4002K PCB and 10-21299K as its keypad. The 4000K instead uses 10B21276K. Do not rely on the similar fan housings to choose a circuit board.
Confirm 4002K on the label before shopping. The control plate, white screen, fan blade and lid have separate part numbers, while the complete roof-vent base is listed by the manufacturer as not available separately. Fan motor selection depends on the pre-/post-February-2012 production date.
Parts pictured in this guide
Select an image for product details, or view the diagrams and parts lists. Match the complete model and part number before ordering.
