Miele Dishwasher Error Code F14 — Heating Pressure Switch Fault
What this means
Error F14 on Miele dishwashers indicates a conflict between the expected water level for heating and what the pressure switch actually reads. The control board will not activate the heating element unless the correct water level is confirmed, to prevent dry-fire damage. This can be caused by a defective pressure switch, air trapped in the pressure switch hose, a leaking sump gasket allowing water to escape, or a faulty circulation pump that fails to build proper pressure.
Alternate codes: F 14
Step-by-step fix
4 stepsReset the dishwasher
Turn off the dishwasher at the power switch or unplug it. Wait 5 minutes, then power it back on and start a new program. Occasionally, an air pocket in the pressure system causes a false F14 that clears on reset.
If the error returns immediately after the machine attempts to heat, the fault is persistent and needs further investigation.
Check the pressure switch and hose
Access the pressure switch (typically mounted on the side of the inner tub or near the sump). Inspect the small rubber hose connecting the sump chamber to the switch. Ensure it is not cracked, kinked, disconnected, or blocked with debris.
Gently blow into the hose — you should hear a click from the pressure switch when air pressure activates it.
Inspect the sump area for leaks
Remove the kickplate and check the base of the dishwasher for water. A leaking sump gasket or circulation pump seal could cause the water level to drop below the threshold, triggering F14.
Even a small leak that is not visible as a puddle can be enough to cause the pressure reading to fall short.
Test the pressure switch electrically
With the dishwasher unplugged, disconnect the pressure switch connector. Use a multimeter to test continuity between the switch terminals while blowing into the pressure hose. The switch should change state (open to closed or vice versa).
If the switch does not click or change state, it has failed and needs replacement.
When to call a professional
If the circulation pump or sump gasket is leaking, or if the control board is not responding to a known-good pressure switch, professional service is recommended.
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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