Kenmore Washer Error Code E4B

E4B indicates an internal problem within the motor drive system, which is the board responsible for controlling motor speed and power output. The drive has detected a fault it cannot self-correct, which could stem from an out-of-range power supply or a failure inside the drive board itself. The first step is always to confirm that the wall outlet is delivering between 102V and 132V AC.

No, you should not continue running the washer while E4B is active. The error indicates a fault in the motor drive system, and operating the machine in this state risks further damage to the drive board, the motor, or connected wiring. Stop use and diagnose the problem before running another cycle.

Repair costs vary depending on the root cause. If the issue is simply a wiring connection or a circuit problem, costs may be limited to a service call fee, typically in the range of $75 to $150. If the motor drive board requires replacement, parts and labor combined can range from $200 to $450 or more depending on the specific model and local labor rates.

Some causes of E4B, such as an unstable outlet voltage or a loose wiring connection, can be addressed without specialized tools. However, if the motor drive board itself has failed internally, replacement is required and involves working with high-voltage components. Technicians with experience in appliance electronics are best suited for board-level diagnosis and replacement.

A reset may temporarily clear the code, but E4B will return if the underlying cause is not corrected. If the fault is caused by a one-time voltage spike, a reset might resolve it. However, if the drive board has failed or the supply voltage is consistently out of range, the error will reappear as soon as the machine attempts to run the motor again.