LiftMaster 2B735 main processor board — also numbered 041B0735, 002B0735 and 41B735 — the main board of the EL25 and EL2000 telephone entry systems. LiftMaster has discontinued this board. It no longer appears in the LiftMaster parts catalog and we cannot order it.
No longer available. This page stays up because the EL25 and EL2000 are still in service on many sites and this is the part people search for. If your main board has failed, the options are below. Do not order the 2B736 input board, 2B737 output board or 2B731 call button board hoping to fix a main-board fault; each of those has its own symptoms.
Is the main board actually the problem?
Before treating the unit as a write-off, rule out the three boards that are still available.
| Symptom | Check first |
|---|---|
| Unit dead, no display | Transformer and power wiring before any board |
| Display alive, keypad or call button dead | The 2B736 input board, or the 2B731 call button board on the EL25 |
| Dials and talks, but the door relay never fires | The 2B737 output board and the strike or maglock supply |
| Will not dial or answer, display alive | The phone line at the terminals — confirm dial tone with a handset |
| Powers up but ignores everything; directory lost | The main board — this part, no longer available |
| Failed after a storm | Surge damage on the phone line or power — usually the main board |
If it really is the main board
| Option | What it means |
|---|---|
| Replace the entry system | LiftMaster’s current telephone entry and intercom range is the CAPXS, CAPXM and CAPXL. A new unit brings cellular or internet calling, video and myQ Business management, and ends the search for EL25 parts |
| Repair or used board | Some board-repair services and used-parts sellers handle the 041B0735. We do not sell used boards, but we can advise on whether a repair is worth attempting for your site |
Specifications
| Part number | 2B735 |
|---|---|
| Also numbered | 041B0735, 002B0735, 41B735 |
| LiftMaster description | Main Board, EL25 / EL2000 |
| Fits | EL25, EL2000 |
| Status | Discontinued by LiftMaster — no longer available |
Related
EL25 parts · EL2000 parts · all LiftMaster access control parts
Not sure what you have or what to do next? Send a photo of the board and the unit to parts@gatehousesupplies.com or call 866-965-5599. We install and service telephone entry systems and can tell you whether a repair or a replacement makes sense for your site. Since 1993.
![Liftmaster Interconnect Board [041B0997]](https://cdn11.bigcommerce.com/s-32eq2wsbti/images/stencil/500x659/products/11537/226482/liftmaster-interconnect-board-041b0997-41b997__08978.1721406092.jpg?c=2 "Liftmaster Interconnect Board [041B0997]")