The short answer
A Miele dryer that leaves lint or marks on clothes is nearly always telling you about its filters. These machines use a filter set rather than a single screen, and the one behind the access panel is the one owners never open. Sorting and load size account for most of the rest, and genuine drum contamination is rare and easy to confirm.
Causes, ranked for this Miele dryer
- Secondary or condenser filter blocked — Why: These machines use more than one filter, and the one behind the access panel is rarely opened, so it silts and starts returning lint to the drum instead of trapping it.
- Lint screen sealed by softener film — Why: A screen that looks clean can be sealed by an invisible film when dry, which stops it passing air and lets lint recirculate.
- Sorting — shedding fabrics with catching ones — Why: Towels and new cottons shed heavily onto dark synthetics, which is a sorting outcome rather than a machine fault however clean the filters are.
- Condenser silted with fine lint — Why: Fine lint packs the condenser fins and both restricts airflow and provides a reservoir of debris, so lint and long cycles appear together.
- Residue in the drum from a previous load — Why: A tissue, a crayon or a leaked pen marks everything afterwards, and wiping the drum confirms or eliminates it immediately.
What to check, in order
- wash the lint screen in warm soapy water and see whether water passes freely. — Because: a film invisible when dry is the classic hidden restriction.
- open the access panel and clean the secondary filter. — Because: it is the top cause and the filter owners most often do not know exists.
- wipe the drum with a damp cloth and look at what comes off. — Because: it confirms or eliminates residue from a previous load immediately.
- dry one sorted load of similar fabrics and compare. — Because: it separates a sorting outcome from a machine fault for the cost of one load.
Checks you can safely do yourself
- Remove the lint screen, wash it in warm soapy water until water passes through freely, and dry it before refitting. — Tools: warm soapy water — Time: several minutes
- Switch off at the breaker, open the lower access panel and rinse the secondary filter under running water until it runs clear. — Tools: the owner guide — Time: several minutes
- Withdraw the condenser if your model allows it, rinse the fins through, and let it drain before refitting fully home. — Tools: the owner guide — Time: the better part of an hour
- Wipe the drum thoroughly with a damp cloth and inspect what comes off onto it. — Tools: a damp cloth — Time: several minutes
- Dry a single sorted load of similar fabrics and compare the result. Stop here: internal ducting is service work. — Tools: none — Time: the better part of an hour, mostly waiting
Before you open anything
Safety
unplug-before-service branch-circuit-15-20a
Switch the machine off at the breaker before opening any access panel and let it cool first. Refit every filter and the condenser fully home, since running with one out of place lets lint reach the heat exchanger and makes the problem permanent. Never dry items contaminated with solvents or oil.
Where the owner fix ends
Cleaning every filter, rinsing the condenser, wiping the drum and sorting loads are owner work. Call a technician when lint persists with every filter clean and the condenser rinsed, since lint is then reaching the drum from inside the ducting; and when marks continue after the drum has been cleaned.
Nearest pages of the same kind
Generalized information — what this page does not cover
family model
This page is generalized information about Miele dryers and covers vented, condenser and heat-pump models together, whose filter sets and condenser arrangements differ substantially. No family-level or model-level page exists in this reference yet; when one is published it will be linked here.
Where to go next
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
