What does Miele dishwasher error code F24 mean?

F24 means the dishwasher heater is not raising the water temperature to the target. Test the NTC temperature sensor, heating element, and thermal fuse with a multimeter. One or more of these components has likely failed.

F24

Miele Dishwasher Error Code F24 — Heating Fault

Advanced Repair 30–75 minutes Tools: Screwdriver set, Multimeter, Towels

What this means

Error F24 indicates the water temperature has not reached the target temperature within the allowed time. The control board monitors the NTC temperature sensor and expects a steady rise in temperature once the heater activates. Causes include a burned-out heating element, a faulty NTC sensor providing incorrect readings, a tripped thermal fuse, loose wiring connections, or a control board relay failure. Without heating, dishes will not be sanitized and detergent may not dissolve properly.

Alternate codes: F 24

Step-by-step fix

4 steps

Check if the water gets warm at all

Run a normal wash cycle for 10–15 minutes, then pause and open the door carefully. Touch the inside of the tub — if the water and tub walls are stone cold, the heater is likely not activating at all. If lukewarm, the heater may be working but at reduced capacity.

Be cautious when opening mid-cycle — steam can escape if water has partially heated.

Test the NTC temperature sensor

Unplug the dishwasher and locate the NTC sensor (usually near the sump or heating element). Disconnect it and measure resistance with a multimeter. At room temperature (20°C), it should read approximately 12–15 kΩ. Significantly different values mean the sensor is faulty.

NTC resistance should decrease as temperature increases. If it reads open-circuit (infinite), the sensor is broken.

Test the heating element

Disconnect the heater terminals and measure resistance with a multimeter. A good Miele dishwasher heater typically reads between 10 and 30 ohms. An open-circuit reading means the element has burned out.

Also test for continuity between each heater terminal and the metal tub (ground). Any reading indicates a short to ground — replace immediately.

Check the thermal fuse and wiring

Some Miele models have a thermal fuse on or near the heating element that blows if temperatures exceed safe limits. Test it for continuity — a blown fuse will read open-circuit. Also inspect all wiring connections to the heater and NTC for corrosion or looseness.

If the thermal fuse has blown, investigate why the heater overheated before simply replacing the fuse.

When to call a professional

If the heating element, NTC sensor, and thermal fuse all test normal, the control board heater relay has likely failed and requires professional replacement.

Related error codes

Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.

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