Code: F24🧺 Miele Dishwasher

Miele Dishwasher F24: Heating Relay Contact Fault (Meaning, Causes, What to Do)

Reviewed 2026-10-26 · Based on 5 manufacturer & service sources

What the code means

Miele's support pages in the US, Canada and UK all describe F24 the same way: "Heating relay contact fault. This is a technical fault that you cannot remedy yourself." The check behind it, as described in Miele service documentation quoted by repairers, works like this: while the circulation pump is stopped, the control checks the contacts of the heater relay. If it sees supply voltage at its inputs when the relay should be open, it stores F24, interrupts the program, starts the drain pump and repeats the fault buzzer four times. In plain terms, the heating element may be getting power at a moment it shouldn't, which is why the dishwasher shuts the program down. F24 is different from the codes for heating that doesn't reach temperature or temperature sensor faults, so don't treat it as a simple "not heating" problem.

Likely causes

Safe DIY checks

⚠ Before you start

F24 involves the power supply to the heating element in a machine that holds water. Keep the dishwasher unplugged or its breaker off until it is repaired, and don't remove panels yourself.

  1. Let the program finish draining, then switch the dishwasher off and unplug it or turn off its breaker.
  2. Don't keep restarting it to clear the code. Miele says this isn't a fault you can fix yourself, and repairers warn that a faulty relay can damage the heating element.
  3. Check under the sink and around the base for signs of a leak, and wipe up any water you can reach without opening the machine. Mention any leak to the technician.
  4. Copy the model number and serial number (on the rating plate on the edge of the door) so Miele Service can book the right parts.
  5. Book a repair through Miele Service or a Miele-experienced appliance technician.

🛠 When to call a pro

  • Any F24: Miele classes it as a technical fault for a technician. The fix involves resistance checks on the heater harness plug and the heater pressure switch, then replacing whichever part is out of spec or the control module.
  • F24 comes back after a new control module: ask the technician to recheck the heater harness plug and pressure switch, since contamination there can make a new board report the same fault.
  • The dishwasher is under warranty or extended cover: use Miele Service first.

Parts that commonly fix it

Always match the part number to your exact model.

⚙

Dishwasher control board (electronics module)

Holds the heater relay. Only replace it after the heater harness plug and pressure switch have been checked. Miele boards are model-specific and often need programming, so this is usually a Miele Service job.

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⚙

Multimeter

For a technician's resistance checks on the heater harness and pressure switch with the machine unplugged.

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Sources

  1. Miele USA support: The dishwasher display shows fault F24 (heating relay contact fault; technical fault you cannot remedy yourself; book a repair)
  2. Miele Canada support: Fault F24 (heating relay contact fault)
  3. Miele Great Britain support: Fault F24 (heating relay contact fault)
  4. Repairdoctors: Miele dishwasher F24 (relay contacts checked while circulation pump is stopped; program stops, drain pump runs, four beeps; causes per Miele service documentation: dirt or moisture on heater harness plug, pressure switch short circuit, faulty control board)
  5. r/appliancerepair thread on a G 7366 with F24 (technician quoting the service manual: contact-blade resistance below 10 megohms, heater pressure switch short, faulty electronics module)

Last reviewed 2026-10-26. Always confirm against the manual for your exact model number.