Dryer High Severity
F03 Miele Error Code

Heater Relay Fault

The F03 error code means the control board has detected a fault with the relay that controls the heating element. The relay is either stuck closed (heater always on) or stuck open (heater never activates).

~5%

DIY Fixable

$250-500

Typical Repair Cost

1-3 hrs

Pro Repair Time

Quick Assessment

Answer to continue safely

Is it safe to keep using?

No. A relay fault means the heater may run uncontrolled (fire risk) or not at all. This is a safety-critical code — do not use the dryer until professionally inspected.

Can I reset the code?

Yes. Yes, but only as a test. If F03 returns or the dryer overheats, stop immediately. A welded relay will not fix itself.

When to stop immediately?

Stop if you notice: F03 returns after reset, The dryer overheats.

Symptoms You May Notice

Dryer overheats

If the relay is stuck closed, the heater runs non-stop

No heat at all

If the relay is stuck open, the heater never activates

F03 at startup

The board runs a relay self-test before starting

Thermal fuse may trip

Overheating from a stuck relay can trip the safety fuse

Possible Causes

1

Stuck Relay on Control Board

The relay contacts have welded together (stuck closed) or the coil has failed (stuck open).

Requires Professional
2

Power Surge Damage

A voltage spike has damaged the relay or its driver circuit.

Requires Professional
3

Heater Element Short

A shorted heater element caused excessive current through the relay, welding it.

Requires Professional
4

Board Trace Damage

The PCB traces around the relay have burned due to overcurrent.

Requires Professional
5

Transient Glitch

A one-time power disturbance may cause a false F03.

DIY Possible

Safe Checks You Can Do

These checks are safe for homeowners. No disassembly required. Do not remove panels or access internal components.
  1. 1

    Power Reset

    Turn off at mains for 15 minutes. A stuck relay may release when fully de-energized.

    15 minutes gives capacitors time to fully discharge.

  2. 2

    Check for Overheating Signs

    Open the dryer door. Does it feel excessively hot inside? Is there a burning smell?

    If yes, the relay may have been stuck closed — do not restart.

  3. 3

    Test After Reset

    Run a short cycle on low heat. Monitor temperature — the dryer should heat and then stop when target is reached.

    If the dryer overheats or does not heat at all, the relay has failed.

  4. 4

    Check Breaker

    If the heater shorted, it may have tripped the household breaker.

    A tripped breaker alongside F03 confirms a serious electrical fault.

  5. 5

    Do Not Ignore

    F03 is a safety-critical code. If it persists, do not continue using the dryer.

    A stuck-on heater is a fire risk.

When to Call a Professional

Contact a qualified Miele technician if:

  • Relay stuck closed (always heating)
  • Relay stuck open (never heating)
  • PCB burn marks near relay
  • Heater element shorted
  • Under warranty

Need Professional Help?

Find qualified Miele technicians in your area for proper diagnostics and repair.

Schedule Appointment

More Dryer Error Codes

View all codes →
F78 F72 F69 F66 F40 F46 F36 F34 F16 F15 F14 F11