Miele T1 Dryer F55: Maximum Drying Time Exceeded

F55 means the program ran out its maximum permitted time and the laundry still didn’t read as dry. The T1 caps drying time as a safety and sanity limit; hitting the cap says either the load was unreasonable or the machine can’t sense dryness anymore.

Rule out the innocent causes first

• Under-spun laundry. A washer spin below ~1000–1200 RPM hands the dryer a swamp. If your W1 recently started leaving loads wetter, the washer may be the patient (see F53).
• Oversized or mixed loads. One king duvet reads “wet” at the sensor bars long after the rest is dry.
• Coated moisture sensors. The two metal bars inside the drum lip get filmed by fabric-softener residue and read dry laundry as… nothing. Wipe them with a damp cloth and a drop of vinegar.

Retry with a normal, well-spun load after those. Most F55s end here.

When it’s the machine

Persistent F55 on sane loads points to the moisture-sensing circuit (bars, wiring, contact to the electronics) or to genuinely weak drying performance — which loops back to airflow (F66 territory) or heat-pump output. We test the sensing circuit directly and measure temperature rise across the process path, so the answer is a reading, not a shrug.

FAQ

The dryer runs for hours with no code some days, F55 other days.

Load-dependent sensing faults behave exactly like that. Keep a mental note of which loads trigger it — duvets and waterproofed jackets are usual suspects.

Is F55 harmful to the machine?

The time cap exists to prevent harm. But chronically long cycles are an efficiency and wear signal worth acting on.

Dryer sheets vs softener — do they matter here?

Both leave sensor film; sheets are slightly kinder. Either way, an occasional bar wipe keeps the sensing honest.