Miele Dishwasher Error Code F24

F24 indicates a heater relay contact fault. The dishwasher's control board detected 120VAC at the heater relay output 18 seconds into the drain cycle, at a point when the relay should be de-energized and its contacts should be open. This means the relay contacts have fused together and can no longer interrupt power to the heating element. The relay must be replaced to clear this fault.

It is not advisable to continue using the dishwasher with an active F24 fault. A fused heater relay means the heating element may receive power at unintended times during the cycle, which poses both an overheating risk and a potential safety hazard. The dishwasher should remain unplugged or have its circuit breaker turned off until the relay is replaced.

Repair costs vary depending on your region and service provider. The heater relay itself is a relatively low-cost component, typically in the range of $15 to $50 for the part. Combined with professional labor, total repair costs generally fall somewhere between $100 and $250. Pricing can vary significantly based on local labor rates and whether additional components require inspection or replacement.

Replacing a heater relay involves working inside the dishwasher with components that connect directly to line voltage, so a qualified appliance technician is strongly recommended. If you are experienced with appliance repair and comfortable working safely around electrical components, the repair involves accessing and replacing the heater relay as described in Section 004-4.8 of the technical documentation. Always disconnect power to the machine before beginning any disassembly.

No, resetting the dishwasher will not clear the F24 error. The fault is caused by a physical hardware failure inside the heater relay, specifically contacts that have fused shut and cannot open. The control board will detect the same unexpected voltage condition on the next cycle and generate the fault code again. The relay must be physically replaced to resolve the error.