Error code · Mora
F18 · Drainage fault
The drainage system is malfunctioning. Check the drainage hose for blockages and ensure it is properly connected.
DishwasherCaution — Know When to StopFixLens verified
Safe first steps
- Inspect the drainage hose for any visible blockages or kinks.
- Ensure the drainage hose is properly connected to both the dishwasher and the drain.
- If the hose is clear and properly connected, check the drain pump for any obstructions.
- If the drain pump is blocked or damaged, arrange a service visit — do not run the appliance.
When to stop
- Stop if you see water leaking from the dishwasher — risk of flooding.
Likely cause
The drainage system is malfunctioning. Check the drainage hose for blockages and ensure it is properly connected.
Verification
Reviewed by: automated manual extraction
Verified against Mora SM6422W1 technical documentation
FixLens publishes its own structured technical logic verified against Mora SM6422W1 documentation · last verified April 23, 2026.