What F18 Means
Miele’s G-series problem summary describes F18 as the flow-meter stationary-state monitor. The flow meter is a small turbine in the fill path that counts water in; F18 is logged when it is not turning at all while the machine believes water should be flowing.
Common Causes of F18
- Flow-meter turbine seized by scale or debris
- No water actually reaching the meter because of a closed valve or blocked filter
- Wiring between the flow meter and the electronics broken
🔧 One Safe Check You Can Try
Check the obvious supply side first: the isolating valve fully open, the fill hose not kinked or crushed behind the machine, and no other heavy draw on the same branch during the fill. If water clearly is entering the machine and F18 still appears, the meter itself is the suspect.
⚠ Why You Shouldn't Go Further Than That
- A meter that reads zero and a supply that genuinely delivers nothing look the same from the display, and only one of them is fixed by a part.
- The flow meter is plumbed into the fill line, so opening it up means isolating the water supply and resealing the joint correctly.
- Running program after program on a machine that cannot count its own fill risks under-filling, which is hard on the circulation pump.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.
Technical Reference
- Code
- F18
- Appliance
- Miele dishwasher
- Maker documentation
- Miele owner manuals and use & care guides
- Checked
- September 2026
Code meanings can change between control generations. Before acting on a code, match the full model number on your appliance's rating label against the manual for that model. We are an independent repair service, not affiliated with Miele & Cie. KG.