Miele PFD 401 Marine Operating Instructions Manual page 82

Problem solving guide
Problem
Fault F 550
Fault F 578
82
Cause and remedy
The waterproof system has reacted.
Close the stopcock.
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Call the Miele Customer Service Department.
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The peak-load negotiation has lasted longer than 2 hours.
Have your electrical system and your energy
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management system tested by a specialist.