Miele PAC 1045 Mode D'emploi page 67

Problem
The red LED flashes and
F1 fault
the message
shown on the display.
Cause and remedy
The internal thermal sensor is defective.
is
Contact the Miele Customer Service Department.

This message can be hidden temporarily by pressing the 
and  buttons briefly at the same time (<1 sec).
en - Problem solving guide
67