Maytag Washer Error Code E303

E303 is an overvoltage alarm (OV1) from the Mitsubishi inverter drive that controls the washer's motor. It means the voltage on the inverter's internal DC bus rose above a safe limit, causing the unit to shut down to protect the motor and drive electronics. This most commonly occurs when a severe load imbalance during the spin cycle causes the motor to decelerate rapidly and feed excessive voltage back into the drive.

You should not continue running the machine while the E303 error is active, as the washer has already halted to prevent damage. Running repeated cycles that consistently trigger the fault can stress the inverter drive and motor. Resolve the underlying cause before resuming normal use.

If the fix is simply redistributing laundry or adjusting habits, there is no cost. If the inverter drive board needs replacement, parts and labor typically range from around $200 to $500 or more depending on part availability and local labor rates. Motor replacement can fall in a similar or higher range. Getting a diagnostic visit from a qualified technician before purchasing parts is recommended.

In many cases, yes. Start by opening the drum and redistributing the laundry so the weight is spread evenly, then restart the cycle. You should also check that the washer is plugged into a properly grounded outlet and that the supply voltage is within the normal range. If the error returns consistently even with balanced loads, the inverter drive board or motor may need professional inspection and replacement.

A power reset, such as unplugging the unit for a few minutes and restarting, may clear the error code if it was caused by a one-time imbalance event. However, if the root cause such as a chronic load imbalance, high supply voltage, or a failing component is not addressed, the E303 fault will return. A reset alone is not a repair.