Dometic RO400 Service Manual page 30

symptom
10. non-normal sound
Water is not produced.
a)
There is rattling
sound from the
motor.
Water is produced.
a)
Normal vibrations
during operation or
flushing (when built-
in or in Domestic
installations.)
20
b) low inlet pressure.
21
c)
loose driving belt.
d)
Vibrating hoses or
something in contact
with rotating parts.
e)
Damaged ball
bearings in the
motor.
tROuBlesHOOting
possible error
Check/action
codes
• Does the motor rotate
properly or has it stopped
(vibrating/rattling)?
• Noticeable sound during
water production or during
flushing.
• Is inlet pressure sufficient?
• Is the inlet pressure sensor
working?
• check driving belt.
• check internal parts. Make
sure nothing is in contact
with the cooling fan for the
motor or the driving belt.
• Does the sound appear from
the motor?
• Noticeable resistance or
sound when the motor axis
is turned by hand?
Remedy
The circuit board is broken and cannot make
the motor turn properly – change circuit board.
Decrease the sound by placing the product on
a thin rubber mat (few millimetres).
Measure the inlet pressure and adjust if
necessary.
Tighten or loosen belt depending on status.
change motor.
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