User manual

7
Maintenance
The device is completely maintenance-free. Use exclusively a dry cleaning cloth for cleaning. Solvents or
sharp-edged tools must not be used.
Troubleshooting
Fault Possible cause Remedy
• After the pump switches on,
the time it takes till hot water
is available at the various taps
differs, sometimes by many
minutes
• Controller switches off
although hot water has not
yet been supplied to all taps
• Fault in the piping system:
No optimum cross-
sections in partial circuits
or bypasses exist in the
system
• Pump capacity too low
• Let controller operate
without return sensor:
Switch off pump after a
fixedly set time
• Use pump with a greater
capacity
• Pump switches on during
heating up of the water in the
hot-water storage tank
although no tap has been
turned on
• Flow sensor arranged too
close to the hot-water
storage tank. Heat contact
to storage tank too close
• Hot-water storage tank
heats up very fast
• Install flow sensor at a
point located farther away
from storage tank
• Do not make any changes
(if no water is withdrawn,
the storage tank will also
be heated only infrequent-
ly; an additional circula-