Dometic RO400 - Page 22

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Symptom
Possible error
codes
Check/Action Remedy

does not stop even
if the valve/faucet is
closed.
The water purier is
ushing.
5
The outlet pressure
sensor is broken, the
wires are cut or the
connection at the
PCB is faulty.
<Not displayed>
Check for dripping water in •
the pure water line located
after the water purier.
(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).
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.
4.
does not start/does
not start to produce
water.
No power to the
system
The green
ON/OFF light is
not lit
Perform a diode check.•
Check the: •
Power supply to the -
product
Fuse (or circuit breaker). -
Wiring -
Screw-down terminals on -
connection blocks
EMC lter -
Pin contact soldering on -
the PCB.
Test if changing the PCB solves the problem.
TROUBLESHOOTING
b)
a)
a)