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LED state
Meaning
Possible cause
Troubleshooting
Red LED
flashes fast
Fault
Inlet pressure too low
If the minimum required admission
pressure of 0.7 bar is not reached,
the system switches off (dry-run
protection for the high-pressure
pump).
Possible fault cause
•
insufficient inlet pressure
Tests/measures for troubles-
hooting
•
Check pressure in public
water mains: are similarly
sized raw water recipients
in operation, which are
influencing the pressure?
•
Is the raw water supply pipe
fully opened?
flashes slowly
Fault
Requested permeate amount
too low
If the minimum requested perme-
ate amount is not reached, the
system shuts down.
Possible fault cause
•
Concentrate return impro-
perly set
•
Motor of high-pressure
pump defective
•
Permeability of membrane
too low
Tests/measures for troubles-
hooting
•
Does the high-pressure
pump start?
•
Does concentrate flow?
Watch concentrate hose in
waste water drain
•
Does permeate flow?
Watch water meter
•
Replace membrane
•
Adjust concentrate return:
increase pressure with
VL110.18 (see section 4.3)
permanently lit
Fault
Permeate conductivity too high
On reaching the maximum prem-
issable conductivity of the perme-
ate the system shuts down.
Please note
: In case of blending
with raw water, the conductivity
measurement does reflect pure
water quality.
Alarm threshold:
100
µS/cm
Possible fault cause
•
Raw water quality has
changed
•
Membrane defective (desa-
lination effect of membrane
too low)
Tests/measures for trouble-
shooting
•
Check water quality
•
Replace membrane
