Miele Washer Error Code F4021

F4021 means the washer stopped its program because it received a peak-load cut-out signal from an external power consumption monitoring system during a heating cycle. The washer is responding correctly to this signal rather than experiencing an internal failure. The source of the issue is typically an energy management device connected to the home's electrical system.

Resetting the washer may clear the error code and allow the cycle to restart, but the error will return if the underlying cause is not addressed. If an external load management system is active, it may send another cut-out signal the next time the washer begins heating. The external system's settings or schedule should be reviewed before restarting a wash program.

If the cause is an external energy management device, there may be no repair cost at all beyond adjusting settings. If a technician is needed to inspect wiring or a control board fault is identified, diagnostic fees typically range from $75 to $150, with control board replacement adding $200 to $500 or more depending on parts and labor rates in your area.

In most cases, resolving F4021 involves adjusting or disconnecting an external energy management system, which a homeowner can often do without professional help. If the error appears without any external monitoring equipment present, or if it recurs after the external system is addressed, a technician should inspect the washer's wiring and control board for faults.

Yes, F4021 does not indicate a hazardous internal fault. The washer stopped as a controlled response to an external signal, and the appliance itself is not damaged. You can restart the cycle once you have confirmed the external monitoring system will not interrupt operation again.