Miele PT 7135 C Operating And Installation Instructions page 26

Cleaning and Care
^ Pull the heat exchanger unit out of its
housing by the handle.
Checking the heat exchanger unit
^ Hold the heat exchanger unit up to
the light as shown.
^ Check to see if there is any fluff
inside it.
The arrows in the illustration above
indicate where to look.
26
If you cannot see any fluff:
^ Replace the heat exchanger unit (see
following page).
If you can see some fluff:
^ Clean the heat exchanger unit as
described below.
Cleaning the heat exchanger unit
^ When rinsing the heat exchanger
unit, make sure you position it as
shown in the next two illustrations.
^ Use a shower head or similar to rinse
the unit out as shown.