Dometic RO400 Service Manual page 29

symptom
7. Intermittent start and
stop.
a) leakage in a section
of the pure water
system located after
the water purifier.
b)
Too high counter
pressure in the pure
water line.
c)
Internal leakage.
8. Broken pCB.
9. Delayed start of
motor.
a)
Too high counter
pressure in the pure
water line.
tROuBlesHOOting
possible error
Check/action
codes
<Not displayed>
• Is the faucet/valve closed?
• If a faucet is used, check if
there is a droplet hanging or
if there is a slow production
of droplets.
• Replace the existing pure
water hose with a new hose
with a valve. Use the valve
to see if the problem is
solved.
• Reduce pressure drop in the
pure water line.
• check the pure water con-
nection for leakages
• Check the filters and filter
containers for signs of
water.
• Remove the cover and check
for signs of water, e.g. in the
accumulator connection, the
outlet pressure sensor con-
nections and the TDS-sensor
connection.
Can be displayed
in various ways.
• Change filter II
Time to change
filter II.
Remedy
If the problem is solved with the new valve,
the problem is most likely due to a leakage
in a section of the pure water system after the
water purifier - try to detect the location of the
leakage.
If the faucet is slowly leaking, remove the
faucet cover and turn the screw. for further
information, please refer to the product's user
manual.
If the counter pressure is too high, e.g. in a
faucet or a valve on the pure water line, this
may result in a too high pressure in the water
line. This causes the outlet pressure sensor to
stop the pump.
change the leaking component.
If no leakage is found, the pure water outlet
valve should be changed due to a defect check
valve inside the pure water valve.
A broken PcB can result in numerous dif-
ferent error codes and symptoms. If a fault
cannot be located, try to change the PcB and
test again.
If filter II change is indicated, the motor start
is delayed by 3 seconds.
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