Genuine LiftMaster K001D8395MC Logic 5 logic board (printed K001D8395) — the single- and three-phase, current-sense-ready main board for every Logic 5.0 commercial door operator: the T, GT, GH, H, HJ, J, SD, GSD and APT lines in their L5 form (T501L5, GH501L5, J501L5 and so on). It replaces the earlier K001D8075-1 and K77-37986, and LiftMaster now supplies this one number for all voltages and both phases.
Logic 5 = separate logic board and power board. Open the electrical box: an L5 box has this logic board plus a power board (single-phase K001D8396-1, three-phase K001D8397, 575 V K001D8397-1). If there is one board with relays on it and no separate power board, the operator is Logic 3 or 4 and this is not the part.
Specifications
| Part number | K001D8395MC (printed K001D8395) |
|---|---|
| Replaces | K001D8075-1, K77-37986 |
| LiftMaster description | Logic Board, 1PH / 3PH, Current Sense Ready, L5 |
| Phase / voltage | All — single and three phase, 115 to 575 V (the power board sets the voltage) |
| Current sense | Ready; three-phase operators built after April 2016 also need the K21-38158 current sense harness |
| Fits | All Logic 5.0 operators: T, GT, GH, H, HJ, J, SD, GSD, APT (501L5 / 503L5 / 505L5 / 331L5 / 751L5 / 101L5 series) |
| Condition | Genuine LiftMaster OEM, new |
Which operators use the K001D8395MC
| Operator family | Parts page |
|---|---|
| T — standard-duty trolley (T501L5, T503L5, T505L5, T331L5, T751L5, T101L5 …) | T parts |
| GT — gear-reduced trolley | GT parts |
| GH — gear-reduced hoist | GH parts |
| H — industrial hoist | H parts |
| HJ — hoist jackshaft | HJ parts |
| J — industrial jackshaft | J parts |
| SD and GSD — slide door | SD parts · GSD parts |
| APT — apartment trolley (APT501L5) | APT parts |
Not for the medium-duty MT / MJ / MH / MGJ — those use the K001A6424. Not for the Maxum DC operators (JDC / RJDC / JHDC / TDC), which have their own main board.
Parts often replaced with it
K001D8396-1 single-phase power board · K001D8397 three-phase power board · K21-38158 current sense harness · K79-15016-1 RPM sensor · K75-36913 e-box cover
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 |
|---|---|
| Operator dead, no lights on either board | Supply and fuses, then the power board, then the logic board |
| Logic board lights up but the motor never runs | The power board and its relays, the brake, then the motor |
| Door runs a few inches and stops, or reverses | RPM sensor and its harness, then the limits, then the logic board |
| Error code on the display | Look the code up in the L5 manual first — most point at a sensor, edge or limit, not the board |
| Board dead after a storm | The logic board — and fit surge protection with it |
After fitting
Set the limits, program the remotes and the timer-to-close, and re-test the monitored entrapment protection. On three-phase units confirm the current sense harness is connected before the first run.
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
T parts · J parts · H 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.
