EN

Severity: Moderate

Miele Dishwasher Error F24 – Fault F24 – Heater Relay Fault

F24 flags the relay that switches Miele's water heater. Miele treats it as a technical fault for service.

At a glance

Severity: 3/5 – Moderate3/5

Severity: Moderate

Meaning
Fault F24 – Heater Relay Fault
Typical repair cost
$0–$800
DIY difficulty
Professional only

On a Miele dishwasher, the heater is switched by a relay on the electronic control module, and the control watches whether that relay actually does what it was told. F24 means the feedback didn't match: the relay didn't pull in when heating was requested, or its contacts appear stuck. Miele classes F24 as a technical fault owners can't remedy and recommends booking a repair. The usual culprits are burnt or welded relay contacts, moisture on the electronics after foam or a leak, and a heater element with an insulation fault that loads the contacts. A heater that leaks current to ground can also trip the kitchen GFCI, which is a useful clue for the technician.

How it looks on the display

Miele Dishwasher display showing error F24

Model families & display variants

Model familyShowsNote
G 5000 and G 7000 with numeric displayF24Same code on US and European models.
Models with a text displayFault F24The display may add a note to contact Miele service.
Older models without a displayblinking indicator lightsThe pattern is listed in the fault table of the operating instructions.

Safety first · Consult a professional

The heater circuit runs on line voltage and the element gets very hot. Don't open the cabinet or the control module; limit yourself to the checks below with the breaker off.

  • Unplug the appliance or switch off the breaker before opening any panel. Mains voltage can kill.
  • Hot surfaces and hot water can cause burns. Let the appliance cool down first.

Symptoms

  • F24 on the display, usually shortly after a program starts
  • Wash water stays cold and dishes come out greasy
  • Cycle stops and the dishwasher beeps
  • Kitchen GFCI or breaker trips when the dishwasher starts heating
  • Earlier F70 or heavy suds before F24 first appeared

Possible causes

Ranked by how often each cause is behind this code (editorial estimate).

  1. Heater relay contacts on the control module burnt or welded 38%
  2. Moisture or detergent residue on the electronics after oversudsing or a leak 18%
  3. Heater element with an insulation fault or partial short loading the relay 17%
  4. Power surge or brownout damaged the relay driver 10%
  5. Loose or corroded connector between module and heater 9%
  6. Control module fault other than the relay 8%

Fix it step by step

Diagnostic flow: F241Write down when F24 appears2One full power reset3Note GFCI or breaker trips4Check for a leak history5Book Miele service

  1. Write down when F24 appears

    Note the program and how many minutes in the fault showed. A fault at the very start of every program points more toward a stuck relay than one that appears only when heating begins.

  2. One full power reset

    Switch the dishwasher off and turn off its breaker for about two minutes, then restore power and start a normal program once. If F24 returns, stop resetting it.

  3. Note GFCI or breaker trips

    If the kitchen GFCI or breaker tripped around the time of the fault, tell the technician. That points toward the heater element rather than only the relay.

  4. Check for a leak history

    Look under the sink and at the toe kick for signs of an earlier leak, and think back to any F70 or foam episodes. Water reaching the electronics is a common trigger for relay faults.

    Tools: Flashlight

  5. Book Miele service

    Give the model and serial number from the rating plate on the door edge and your notes. The technician can test the heater's resistance and insulation and check the relay on the module.

How to reset F24

  1. Switch off, turn off the breaker for about two minutes and restore power.
  2. Start a program; if F24 doesn't return, watch the next few cycles for cold water.
  3. If F24 comes back, don't keep cycling power: repeated attempts can further damage the relay contacts.

Where the parts are

Dishwasher: filter, drain pump and sump – F24123456789
Dishwasher: filter, drain pump and sump
  1. 1Door lock
  2. 2Water inlet valve
  3. 3Filter
  4. 4Circulation pump
  5. 5Heating element
  6. 6Drain pump
  7. 7Float switch
  8. 8Temperature sensor
  9. 9Water level sensor

Repair options & costs

RepairDIY?Estimated cost
Power reset and observation Yes $0
Miele service call and diagnosis No $150–$250
Control module replacement No $400–$800
Heater replacement No $300–$550
Wiring or connector repair No $180–$300

Rough US estimates; technician call-out fees vary by region. Not a quote.

When to call a technician

F24 is a service fault: call Miele or a Miele-trained technician as soon as it repeats after one power reset. Call right away if the GFCI tripped or you smell something hot, since a heater with an insulation fault is an electrical hazard.

Frequently asked questions

Can I keep using the dishwasher with F24?

Not reliably. The dishwasher stops when it detects the fault, and if it does run, it may not heat. Repeatedly forcing cycles can also make relay damage worse.

Why would a leak cause a relay fault?

Oversudsing or a leak can wet the electronics or connectors. Detergent residue is conductive and corrosive, and it can pit the relay contacts or the tracks around them.

Is F24 related to F14?

They are different faults. F14 means the circulation pressure wasn't reached, so heating is held back. F24 is about the relay that switches the heater itself.

Is it worth repairing an older Miele with F24?

Often yes, because Miele dishwashers are built for a long service life. Get a quote for the module or heater first and compare it with the age and condition of the rest of the machine.

Sources