Bosch Washer E43 Error Code: Causes, Cost & Fix

What is the Bosch Washer E43 error?#

E43 on a Bosch washer means the motorized door-lock actuator failed to operate — and the key thing to understand is that E43 is not the same as E27. Where E27 is about the board not detecting a locked door, E43 specifically points to the lock motor itself, or the control-board relay that powers it, failing to drive the latch. You will often find the door locked and refusing to release, a repeated clicking from the door area, or a delayed unlock after a cycle. It is not dangerous, but a door stuck locked with laundry inside is genuinely inconvenient, which is why the first thing I tell owners is where the emergency release lives: behind the pump filter access panel at the bottom front of the machine is a small pull tab that manually releases the door.

E43 on a Bosch Washer: likely causes and repair cost#

On a Bosch Washer, the E43 code signals: door lock motor error.

Typical professional repair: $150–$350 · Difficulty: hard · usually a technician job

Symptoms that often accompany E43: Door locked and will not release; Clicking sound from door area repeatedly; Door unlock delayed after cycle

Technician diagnostic sequence for E43:

1. Power cycle the washer — wait 5 minutes before retrying
2. Check door lock motor for 120VAC at connector during lock attempt
3. Measure lock motor coil resistance (expect 800-1200 ohms)
4. If voltage present but motor does not engage, replace door lock assembly
5. If no voltage at connector, inspect control board relay

Parts a technician may check or replace: door lock assembly; main control board

Field note: E43 differs from E27 — E43 specifically indicates the motorized lock actuator failed (not the detection circuit). On EcoSilence Drive models, the board uses a separate relay for the lock motor. A failed relay gives E43 even with a good lock.

Safety note: If the door is locked with laundry inside, the emergency release pull tab is behind the pump filter panel at the bottom front. Pull the tab to manually release the door before servicing.

How to troubleshoot the E43 error yourself#

The table above rates E43 as "hard" and "usually a technician job," so the owner role is safe triage plus knowing the emergency release. Start with a full power cycle: unplug the washer or switch off its breaker, wait five minutes, and restore power — a transient board glitch can set E43 and a reset occasionally clears it. If the door is locked with laundry trapped, open the pump filter panel at the lower front and pull the emergency release tab to free the door; that gets your laundry out while you arrange a repair. Beyond that, the diagnosis is a technician's. They will check whether line voltage is actually reaching the lock motor at its connector during a lock attempt: if voltage is present but the motor does not drive, the lock assembly has failed; if there is no voltage, the fault is upstream at the control-board relay. This split is exactly why E43 differs from E27 — on EcoSilence Drive models the board uses a separate relay just for the lock motor, and a failed relay produces E43 even with a perfectly good lock. Do not force a locked door; use the release tab and let a technician confirm which side of that connector has failed.

Is the Bosch Washer E43 error worth fixing?#

E43 is usually worth repairing, though it sits a step above the plain lock code because a failed motor or board relay is involved. The table above lists $150 to $350, covering the door lock assembly or, when the relay is at fault, the main control board, plus labor. At the low end, replacing a failed lock motor assembly is a clear yes on any working machine — a washer you cannot reliably lock or unlock is not usable. The cost reaches toward $350 when the fault is the control-board relay rather than the lock itself, since the board is the pricier part. On a Bosch under about eight years old, even that is reasonable against a new machine. As with E27, I only lean toward replacement if E43 lands on an older washer already needing other repairs and the total approaches half the price of a new one.

Bosch Washer E43: frequently asked questions#

What does the E43 error mean on a Bosch Washer?#

E43 is a door-lock motor error: the motorized lock actuator, or the control-board relay that powers it, failed to drive the latch. It differs from E27, which is about the board not detecting a locked door. Symptoms include a door stuck locked or a delayed unlock.

Is it safe to keep using a Bosch Washer that shows the E43 error?#

There is no hazard, but the door may be stuck locked and the machine will not run a normal cycle. If laundry is trapped, use the emergency release behind the pump filter panel to free the door, then arrange a repair.

Can I clear the E43 error myself, or do I need a technician?#

You can try a five-minute power cycle and use the emergency release tab to free a locked door, but E43 is a hard, usually-technician job. Testing for line voltage at the lock motor and diagnosing the board relay requires a meter and safe access.

How much does it cost to repair the E43 error on a Bosch Washer?#

The table above lists $150 to $350. The low end covers replacing the door lock assembly; the high end applies when the control-board relay that drives the lock motor has failed, since the board is the costlier part.

Which parts usually fail when a washer throws the E43 code?#

The lock motor within the door lock assembly is the most common failure, followed by a control-board relay issue, with wiring damage less common. On EcoSilence Drive models a failed lock-motor relay on the board can produce E43 even with a good lock.

Is a Bosch Washer with the E43 error worth repairing?#

Usually yes. A washer that cannot lock or unlock reliably is unusable, and the $150 to $350 in the table above is well below replacement. Only on an older machine with other major faults, nearing half a new washer, does replacement make sense.

Why does lock motor failure trigger the E43 error?#

When the board commands the door to lock or unlock, it expects the motorized actuator to drive the latch. If the lock motor fails, or the board relay that powers it does not switch, the latch never moves as commanded, so the board raises E43. This is distinct from E27, which flags a missing lock-detection signal.