Genuine LiftMaster 050DCDDOWFMC logic board — the DC Wi-Fi logic board for the DDO8900W dock door operator. The DDO8900W runs the LJ8900W's 12 V DC motor and battery backup, but its logic board, transformer and the K002D2085 LMI5 dock door interface board are specific to the dock door application and are not shared with the LJ8900W or LJ8950W.
Two boards on this operator. The 050DCDDOWFMC is the main logic board with the yellow learn button; the K002D2085 is the LMI5 dock interface board that talks to the dock leveler and vehicle restraint. Read the number on the board that has failed.
Specifications
| Part number | 050DCDDOWFMC |
|---|---|
| LiftMaster description | Logic Board, Dock Door Jackshaft |
| Learn button | Yellow — Security+ 2.0 |
| Connectivity | Wi-Fi, myQ |
| Fits | LiftMaster DDO8900W (DDO8900WMC) |
| Condition | Genuine LiftMaster OEM, new |
Which operators use it
| Operator | Board | Parts page |
|---|---|---|
| DDO8900W dock door operator | 050DCDDOWFMC — this board | DDO8900W parts |
| LJ8900W light-duty jackshaft, sectional door | 050DCJCWFSDMC | LJ8900W parts |
| LJ8950W light-duty jackshaft, rolling door | 050DCJCWFRDMC | LJ8950W parts |
Parts often replaced with it
K002D2085 LMI5 dock door interface board · 485LM backup battery · 041B8861 travel module
Is the board actually the problem?
The logic board is the most over-ordered part on a commercial operator. Work down this list before you buy:
| Symptom | Check first |
|---|---|
| Door will not open while a trailer is at the dock | That is the interlock doing its job through the LMI5 interface board — check the restraint and leveler signals first |
| Dead, no lights | Supply and transformer, then this board |
| Runs on AC but not on battery | The 485LM battery |
| Runs a few inches and stops | Door balance, then the travel module, then this board |
| Dead after a storm | This board — fit surge protection with it |
After fitting
Set the travel limits, re-add the operator in the myQ app, and re-test the dock interlocks and the entrapment protection before returning the door to service.
Fit surge protection when you fit the board. Lightning and utility surges are the most common reason a commercial operator board is replaced, and a new board on the same unprotected supply is at the same risk. The MOV kit on the electrical box is the first line; a proper surge arrester on the supply is the second.
Related
DDO8900W parts · LJ8900W parts · all LiftMaster commercial door parts
Not sure which board you need? Send a photo of the number printed on your existing board to parts@gatehousesupplies.com or call 866-965-5599. We would rather confirm it than have you fit the wrong board.
![Liftmaster DDO8900W Light-Duty Commercial Dock Door Operator [DDO8900WMC]](https://cdn11.bigcommerce.com/s-32eq2wsbti/images/stencil/500x659/products/15497/226077/liftmaster-ddo8900w-light-duty-commercial-dock-door-operator-ddo8900wmc-ddo8900w__11452.1725051274.jpg?c=2 "Liftmaster DDO8900W Light-Duty Commercial Dock Door Operator [DDO8900WMC]")
