Stulz UltraWater 120 basic, Technical Manual, Page: 42 / 50

Troubleshooting
STULZ UltraWater 3-stage reverse osmosis system SUW
© STULZ GmbH, Hamburg
- 42 -
Quality of pure water is too poor Water quality monitoring system
is faulty
Check or replace water quality
monitoring system.
Prefilter extremely contaminated Replace prefilter insert.
Pure water quality of untreated
water is too poor
Install a deionizer behind the mem -
brane, or choose a system model
with a higher retention rate.
Blocked membrane Replace membrane. If the mem -
brane quality has declined dra -
matically over a short time (approx.
6 months), the system should be
supplied with softened water, or
equipped with an upstream hard -
ness stabilization filter.
No waste water flows during
operation
Waste water hose (red) kinked Get rid of the kink.
Faulty flow restrictor Replace flow restrictor.