The F15 error on your Miele Dishwasher means there’s a problem with the water intake system, specifically that water is entering the machine continuously or the fill time has been exceeded. This typically indicates a faulty water inlet valve, a defective flow meter, or a control board issue.

Error code F15
Meaning Continuous water intake or fill timeout
Severity High — Can cause flooding and water damage if not addressed
Time to fix 30–90 minutes
Tools needed Multimeter, screwdriver set, towels, bucket

What the F15 error means

The F15 error code indicates that your Miele dishwasher has detected an abnormality in the water intake process. Either water is flowing into the machine when it shouldn’t be, or the dishwasher cannot achieve the proper water level within the expected timeframe. This error is a safety feature designed to prevent flooding and water damage to your kitchen.

When this error occurs, the dishwasher’s control system detects that the water inlet valve isn’t functioning properly, the flow meter is providing incorrect readings, or there’s a blockage preventing normal water fill. The machine will typically stop the cycle and may activate the drain pump to remove excess water as a protective measure.

Common causes

  • Faulty water inlet valve stuck in the open position, allowing continuous water flow
  • Defective flow meter (water quantity sensor) sending incorrect signals to the control board
  • Kinked or blocked water supply hose restricting water flow and causing extended fill times
  • Low water pressure from the household supply preventing proper filling
  • Control board malfunction misinterpreting sensor data from the water intake system
  • Clogged inlet valve screen restricting water flow and extending fill cycle

How to fix the F15 error

  1. Turn off water supply and check for leaks: Immediately shut off the water supply valve under your sink. Pull the dishwasher out slightly and check for any standing water or active leaks around the water inlet valve area. Place towels down to catch any water and verify the inlet valve isn’t stuck open.
  2. Inspect the water supply hose and pressure: Disconnect the water supply hose from the inlet valve and check for kinks, blockages, or damage. Clean the inlet screen filter at the valve connection point, removing any debris or mineral buildup. Turn on the water supply briefly into a bucket to verify adequate water pressure (should be 20–120 psi).
  3. Test the water inlet valve: Locate the inlet valve (usually at the front-left base of the dishwasher). Disconnect power to the unit, then use a multimeter to test the valve’s solenoid coils for continuity—they should read approximately 500–1500 ohms. If there’s no continuity or the valve shows signs of damage or mineral buildup, replace it with a Miele OEM part (approximately $80–150).
  4. Check the flow meter sensor: Access the flow meter (water quantity sensor), typically located near the inlet valve or in the sump area. Inspect the impeller inside for debris or calcium buildup that could prevent it from spinning freely. Clean it carefully or test its electrical connections with a multimeter. If defective, replace the flow meter (approximately $100–180).
  5. Reset the dishwasher and test: After repairs, reconnect all components, restore water supply, and plug in the dishwasher. Press and hold the Start button for approximately 5 seconds to reset the error code. Run a short rinse cycle to verify the F15 error has cleared and the dishwasher fills properly.
  6. Contact a professional if needed: If the error persists after checking all components, the control board may be faulty and require professional diagnosis. Miele control board issues can be complex, and replacement costs range from $300–600 including parts and labor.

FAQ

Can I continue using my Miele dishwasher with the F15 error?
No, you should not use the dishwasher when the F15 error appears. This error indicates a water intake problem that could lead to flooding and water damage to your kitchen floor and cabinets. Address the issue immediately to prevent costly damage.

How much does it cost to fix a Miele dishwasher F15 error?
The cost depends on the root cause. A DIY inlet valve replacement costs $80–150 for the part, while a flow meter runs $100–180. Professional repair typically costs $200–400 for parts and labor. Control board replacement is more expensive at $300–600 total.

Why does my Miele dishwasher show F15 only sometimes?
Intermittent F15 errors often indicate a water inlet valve that’s beginning to fail or debris partially blocking the flow meter. The valve may stick occasionally or low water pressure during peak usage times may trigger the error. You may also have a loose electrical connection at the flow meter that causes intermittent signal loss.