Stulz UltraWater 400 basic - 13 Troubleshooting

STULZ UltraWater 3-stage reverse osmosis system SUW Troubleshooting
© STULZ GmbH, Hamburg
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13. TROUBLESHOOTING
Problem Cause Remedy
System does not switch on Water is not connected Connect the system to the drinking
water mains and turn on the tap.
Insufcient water pressure Make sure the inlet water pressure
is at least 1 bar.
Transformer is not connected Insert the transformer plug into a
live socket.
Pressure tank is full The system can only start up again
when the pressure tank is roughly
half empty.
Faulty transformer Replace transformer.
Faulty solenoid valve Replace solenoid valve.
Faulty intake pressure switch Replace intake pressure switch.
Faulty tank pressure switch Replace tank pressure switch.
System does not switch off The consumer is still using water The system can only switch off
when the consumer is no longer
using water and the pressure tank
is full.
Faulty tank pressure switch Replace tank pressure switch.
System does not produce
enough pure water
The consumer is using more
than the nominal throughput of
the reverse osmosis system
Replace the system with a more
powerful one.
The supply water is extremely
cold
Replace the system with a more
powerful one.
Faulty pressure pump Replace pressure pump.
Clogged prelter Replace prelter insert.
Reduced membrane throughput Replace membrane. If the mem-
brane throughput has declined
dramatically over a short time (ap-
prox. 6 months), the system should
be supplied with softened water, or
equipped with an upstream hard-
ness stabilization lter.
System switches on regularly
although the consumer has not
taken any water
Faulty non-return valve Replace non-return valve.
System switches on and off in
rapid succession (within a few
minutes)
Pressure tank valve is closed Open pressure tank valve.
Faulty pressure tank Replace pressure tank.