Miele TOUCHTRONIC T 1303 Operating Instructions Manual page 18

The dryer is not operating efficiently
because the duct hose is too long.
The airflow is insufficient in the area of
the dryer.
The lint filters are clogged.
The laundry was not spun sufficiently in
the washer.
The dryer is overloaded.
Metal zippers interfere with the dryer's
moisture sensors.
An airflow gap of 3/8" (10 mm) must be
provided between the machine and the
floor.
The load contained too many dissimilar items (size and fabric.)
This is condensed moisture from the laundry.
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Check the exhaust length and diameter
(see "How to calculate the effective
duct length"). A long exhaust hose will
increase program times and energy
consumption.
If the exhaust hose cannot be
shortened, the indicator can be turned
off by a service technician.
Open a window or door to increase
airflow.
Clean the lint filters (see "Dryer care").
Select a higher spin speed in the wash
program.
Reduce the load size.
Select a timed program to avoid
overdrying.
This gap must not be blocked by a
toekick or thick piled carpets for
sufficient airflow.