Step-by-Step DIY Fix Guide
- SAFETY: Disconnect power before checking hose connections.
- Trace the water supply hose from the shut-off tap to the dishwasher inlet — straighten any kinks.
- Turn off the water supply and disconnect the supply hose from the dishwasher inlet.
- Inspect and clean the mesh filter screen inside the inlet port — remove all scale and sediment.
- Reconnect the hose securely, turn the water supply back on, and check for drips.
- Plug in and run a test cycle — confirm the machine fills normally.
- If F18 persists after a clear hose and clean inlet screen, contact Miele service.
If it's still not filling correctly
- If normal household water flow looks good but the code returns, the inlet-valve or fill-sensing path becomes more likely.
- If the door closes normally but the warning keeps returning, the latch or switch path becomes more likely than a simple alignment issue.
- F18 persists after inlet screen is clean and water pressure is confirmed adequate
What This Error Means
Error F18 on your Miele dishwasher means: The dishwasher's flow meter is reading zero or near-zero water flow when the machine expects water to be entering. The machine has stopped because it cannot confirm water is reaching the wash system. The dishwasher's self-diagnostic system has detected this condition and stopped or interrupted the current cycle.
The most frequent cause is supply hose kinked — a bent hose can completely block flow to the flow meter. Work through the causes and fix steps below in order — many Miele dishwasher errors can be resolved without a service call.
Many cases of F18 can be resolved by the homeowner. The steps below cover the full DIY checks — if they do not resolve the error, a Miele-certified technician is needed.
Most fill errors trace back to the water supply tap under the sink — it is often partially closed after a plumber visit or dishwasher installation. Confirm the tap is fully open before investigating anything further.
What users usually notice before this code
Miele dishwasher warnings like this often show up after standing water, slow draining, heavy food residue, or a cycle that never returned to normal at the end.
Common misdiagnoses
- Assuming the display code proves one exact failed part before the safe first checks are done.
- Blaming a pump or valve first when a blocked path, filter, hose, or household plumbing issue is still possible.
- Replacing a lock or latch too early when alignment, trapped laundry, or startup conditions may still explain the warning.
Most Likely Cause by Symptom
The Miele dishwasher may stop, pause, or refuse to complete the cycle normally.
Likely cause: Supply hose kinked — a bent hose can completely block flow to the flow meter
Check first: SAFETY: Disconnect power before checking hose connections.
Common Causes
- Supply hose kinked — a bent hose can completely block flow to the flow meter
- Inlet filter screen clogged — scale and sediment block the mesh screen at the hose connection
- Household water pressure too low to open the inlet valve fully
What Not to Do
- Do not force-start the dishwasher with F18 active — running the wash pump without water will damage the circulation pump
Model and Display Variation Notes
Model-family notes
- Miele dishwasher display wording and code formats can vary by series.
- If your model behaves differently, check the owner manual before trying any deeper maintenance step.
Display and panel differences
- Panel wording can vary by series, so confirm the exact code pattern before buying parts.
Parts, Tools and Service Options
Common parts
- Flow meter sensor if sensor has failed ($30-$70)
- Water inlet valve if valve is not opening fully ($40-$100)
Manual and model check
Check your exact model and manual before ordering any Miele dishwasher parts.
Service option
Miele service visit if the warning returns after the basic checks are complete.
Suggestions in this section are organized to support the troubleshooting flow first. Any future affiliate relationships should be disclosed clearly.
When Not to Keep Troubleshooting
F18 persists after inlet screen is clean and water pressure is confirmed adequate
How to Prevent It Recurring
- Inspect the inlet filter screen annually — gradual scale accumulation reduces flow without triggering an immediate error
Related Error Codes
F12
The dishwasher failed to fill with water at the beginning of a program step. The machine did not detect sufficient water entering the tub within the expected time.
F13
The dishwasher's water inlet valve has been identified as defective. The valve is not opening or closing correctly, preventing the dishwasher from filling normally.
Helpful guides for this problem
Guide
What to check before replacing a dishwasher drain pump
The checks worth doing before you blame the drain pump and spend money on a fix that may not be the real problem.
Guide
How to tell if a dishwasher problem is drainage or leak-protection related
How to tell whether a dishwasher water-related warning is about drainage or a more cautious leak-protection stop.
Guide
Most common Bosch dishwasher error codes and what they usually mean
A clearer look at the Bosch dishwasher codes owners run into most often and what is worth checking before booking service.
When not to keep pushing DIY troubleshooting
Use the code page for one careful first pass, then stop if the same warning returns or the appliance still cannot get back to normal operation.
Extra notes
- This page is based on Miele support material and stays conservative where model-specific guidance may vary.
- The goal is to help you identify safe first checks before you move into parts, service, or model-specific manual lookup.
Source and model notes
Last reviewed: 2026-04-09
Based on: Based on Miele support material and edited into consumer-safe guidance for the exact code family on this page.
View Miele USA Official Support
Model coverage note: Miele dishwasher code meanings can vary by series, control panel, and model family, so use this page as a safe starting point rather than a replacement for the model-specific manual.
Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.
Always disconnect power before inspecting appliances. If unsure, contact a licensed appliance technician.