Dometic RO400 Service Manual page 26

symptom
Alarm, too low pres-
e)
sure due to a reject
valve that does not
close.
13
f)
Alarm, too low
pressure due to an
inlet valve that does
not open - either the
valve is faulty or not
energized.
14
tROuBlesHOOting
possible error
Check/action
codes
• Start the water purifier.
check if it produces any
pure water or if the flow is
very low.
• Measure the water flow in
the reject hose.
• When the motor is running,
check that the inlet valve is
energized.
• Check if any water flows
in the drain hose when the
product is flushing. If water
flows, the inlet valve is
open.
• Verify that the water purifier
is disconnected and then,
with care, slightly open one
of the filter containers. Re-
connect the product. check
if any water comes out of
the filter container. If so, the
inlet valve opens properly.
Remedy
If the reject valve remains in a flushing
position - change the reject valve.
In this case the reject flow will be > 5 l/minute.
If the inlet valve is not energized (no power to
the inlet valve), a wiring fault or a soldering
of a contact on the PcB might be the cause.
Replace the inlet valve if no water flows from
the filter container or in the drain hose (the
inlet valve does not open).
To avoid excessive
water spillage, be
ready to unplug the
product.
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