Dometic RO400 Service Manual page 28

symptom
The measured
conductivity indicates
a problem with the
purification.
c) flushing does not
work properly. Bro-
ken reject valve.
17
d)
low pump pres-
sure.
18
e)
Broken membrane.
f) Poor recirculation
flow.
19
tROuBlesHOOting
possible error
Check/action
codes
• Disconnect and connect
the water purifier. Flushing
starts and allows cold water
to enter the product.
Verify that the:
-
flushing commence after
the tap/valve is closed,
-
reject flow is normal, and
-
reject valve is energized.
• Measure the pump
pressure.
• Measure the conductivity in
the inlet and the pure water.
• Measure the conductivity of
the pure water continuously
(several minutes).
• If conductivity increases
continuously after start
of pure water production,
check that:
-
The bottom of the mem-
brane is not blocked due to
fouling, particles etc.
-
The membrane tape has
not been unwinded (as-
sembly has to be dis-
mounted).
Remedy
The reject flow is:
x 3 l/min — RO600c
2 l/min — RO400B, RO400Bc and RO400c
x
x 0.8 l/min — RO400.
Replace the reject valve if the reject flow is
> 5 l/min or much lower than the values given
above.
If the reject valve is not energized, check the
connections. Install a new PcB to see if that
solves the problem.
If the pump pressure and the water flow is low
in addition to a poor water quality - change the
pump, see "
If the flow is OK and the water quality poor
from the start and it does not improve - change
the membrane, see "
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SERVIcE
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SERVIcE