Genuine LiftMaster K1D8388-1CC main control board — the UL325 board for LiftMaster’s linear actuator (arm-type) swing gate operators built from 2016 on: the LA400U / LA400UL, LA412U / LA412UL and LA500U / LA500UL, and the LA400PKGU(L), LA412PKGU(L) and LA500PKGU(L) packages built around them. One board serves all three. LiftMaster now supplies it as kit K1D8388-1CCMC.
How to identify it. The label reads K1D8388-1CC or K1D8388-1CCMC. The sticker on the circuit board itself often reads 001D9040-1CC (also written K1D9040-1CC) — that is the board’s own number, not something you can order. Either means this is the right board.
Two look-alikes to avoid. K1D8052-1CC is the earlier, pre-UL325 board for the same arm operators. K1D8389-1CC is the UL325 board for the pad-mount operators (RSL12U, RSW12U, CSL24U, CSW24U), not the arm operators. Read the number on your board before ordering.
Specifications
| Part number | K1D8388-1CC |
|---|---|
| Current kit number | K1D8388-1CCMC |
| Also seen on the board | 001D9040-1CC / K1D9040-1CC (sticker on the PCB) |
| LiftMaster description | Main Board, Linear Actuators, UL325 |
| Standard | UL325 (2016) |
| Condition | Genuine LiftMaster OEM, new |
Which board does my operator take?
Each arm operator family has gone through three boards. The one you need depends on the generation, not the model name on the arm — open the control box and read the board.
| Operator | Original | Second generation | UL325 (2016 on) |
|---|---|---|---|
| LA400 family | K001A6039 — LA400, metal box | K1D8052-1CC — LA400DC | K1D8388-1CC — LA400U, LA400UL |
| LA412 family | K001A6426-1 — LA412, metal box | K1D8052-1CC — LA412DC | K1D8388-1CC — LA412U, LA412UL |
| LA500 family | K1D7545CC — LA500, no longer available | K1D8052-1CC — LA500, LA500DC | K1D8388-1CC — LA500U, LA500UL |
Dual-gate installations. The board connects to the secondary arm through a plug-in terminal. If the old plug is damaged or missing, order the K023B0556-6 arm terminal plug (sold in packs of four) with the board.
Upgrading an older arm operator to UL325? LiftMaster’s K1D8388-1CCUMC kit bundles this board with monitored photo eyes. UL325 requires monitored entrapment protection, so a bare board on an unprotected site will not put the gate back in service.
Parts that go with this board
| Part | Notes |
|---|---|
| K1D8387-1CC expansion board | UL325 expansion board for the added inputs — loops, extra safety devices, accessories |
| K75-36635 mounting bracket | Board mounting bracket |
| Reset switch with ID resistor | The reset switch carries the operator ID: K94-36408-2 (LA400), K94-36408-3 (LA412), K94-36408-1 (LA500) |
| Plastic control box, U models | K74-36798-5 (LA400U), K74-36798-6 (LA412U), K74-36798-4 (LA500U) |
| Plastic control box, UL models | K74-39307-2 (LA400UL), K74-39307-3 (LA412UL), K74-39307-1 (LA500UL) |
| Batteries | Two 29-NP712 12V 7AH batteries, or the pre-wired pair K74-30762 |
| Radio | K77-36541 antenna, K001A5747 receiver module |
Is the board actually the problem?
On these operators the board is the most expensive part in the box and often not the fault. Check these first.
| Symptom | Check first |
|---|---|
| Gate slows, stops partway, reverses on its own, or dies in a power cut | The batteries. These operators run off the batteries; the transformer only charges them. Replace both 29-NP712 at the same time |
| Operator completely dead, no lights on the board | Transformer and receptacle before the board — on the LA500 the LA500HDTKITSTD transformer kit |
| Display shows the wrong operator type after fitting | The reset switch and its ID resistor (K94-36408-2, K94-36408-3 or K94-36408-1), not the board |
| Gate will not reset after an obstruction | The reset switch |
| No response to remotes, wired controls work | The K77-36541 antenna or K001A5747 receiver module |
| Loops or accessories not responding | The K1D8387-1CC expansion board, then the loop detector |
| Arm hums but the gate does not move | The actuator arm, not the board |
| Burnt smell, scorching or a bulged capacitor on this board | This board — replace it |
After fitting
The new board arrives unprogrammed. Set the travel limits and force, relearn every remote and transmitter, and re-enter timer, loop and accessory settings. Re-test every entrapment protection device to UL325 before returning the gate to service.
Fit surge protection at the same time. Storm damage is a leading cause of gate operator board failure. If this board died after a storm, the replacement is at the same risk unless the installation is protected.
Common questions
My board says 001D9040-1CC. Is this the right one? Yes — that number is on the sticker of the K1D8388-1CC.
Will it fit my LA500 or LA412DC? No. Those take the K1D8052-1CC. This board is for the U and UL generations only.
Is it the same board on the LA400UL, LA412UL and LA500UL? Yes. The control box, reset switch and batteries differ by model; see the table above.
Is this genuine? Yes, genuine LiftMaster OEM.
Related
LA400 parts · LA412 parts · LA500 parts · LiftMaster arm-type swing gate operators
Not sure which board you need? Send a photo of your existing board to parts@gatehousesupplies.com or call 866-965-5599. We would rather confirm it than have you fit the wrong board.
