Miele Washer Error Code F4264

F4264 indicates an EFU fault overrun, meaning there is a communication timing failure between the EFU 235 frequency converter unit and the ELP 235 power module. These two boards must exchange data continuously during operation to control motor speed and drum function. When that communication exceeds its timing limit or fails to complete correctly, the machine logs F4264 and stops the cycle. This is an internal electronics fault that typically requires professional diagnosis.

A power reset may temporarily clear the fault display, but it will not resolve the underlying communication problem between the EFU 235 and ELP 235. If the root cause is a failing connection or module, the fault will return once the machine attempts to run a cycle. A reset is useful for confirming whether the fault is intermittent, but it should not be treated as a repair.

Repair costs vary depending on the root cause. If the issue is limited to a wiring harness or connector repair, costs may range from roughly 100 to 250 dollars including labor. If the EFU 235 or ELP 235 module requires replacement, parts costs for Miele electronic boards can be significant, and total repair costs including labor could range from 300 to 700 dollars or more depending on which module is faulty and local service rates.

A knowledgeable DIYer can start by checking the wiring harness and connectors between the EFU 235 and ELP 235 modules for loose pins, corrosion, or visible damage, as a poor connection is the most accessible cause. However, if the fault lies within one of the electronic modules, component-level diagnosis and board replacement are best handled by a qualified technician. Attempting to replace either board without proper diagnostic tools risks unnecessary parts costs.

The washer will typically stop operation and prevent the cycle from completing when this fault is active, so continued use is not possible in most cases. Attempting repeated resets to force cycles through a known electronics communication fault is not recommended, as it could place additional stress on the affected modules. The machine should be assessed by a technician before returning it to regular service.