Dometic RO400 Service Manual page 22

symptom
3. The water purifier
does not stop even
if the valve/faucet is
closed.
a)
The water purifier is
flushing.
5
b)
The outlet pressure
sensor is broken, the
wires are cut or the
connection at the
PcB is faulty.
4. The water purifier
does not start/does
not start to produce
water.
a) No power to the
system
tROuBlesHOOting
possible error
Check/action
codes
<Not displayed>
• check for dripping water in
the pure water line located
after the water purifier.
(Usually a leakage in a con-
nection results in intermit-
tent start and stop and not a
complete stop. Otherwise,
a large leakage would be
visible.)
• check the soldering at the
PcB.
• carefully short circuit pin
1 and 4 at the PcB connec-
tion of the sensor. This will
indicate full pressure and
the system should stop.
• An other alternative is to
switch the high and the
inlet pressure sensors (both
physically and at the con-
nections at the PcB).
The green
• Perform a diode check.
ON/OFF light is
• check the:
not lit
- Power supply to the
product
-
fuse (or circuit breaker).
-
Wiring
-
Screw-down terminals on
connection blocks
-
EMC filter
-
Pin contact soldering on
the PcB.
Remedy
If soldering is faulty, change the PcB.
If system stops when the two pins are short
circuited, change the outlet pressure sensor.
If the system stops after the two pressure sen-
sors have been exchanged, put back the inlet
pressure sensor and replace the faulty outlet
pressure sensor.
Test if changing the PcB solves the problem.
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