8 – 5
m
alfunCTions
8
©
IT
4000
9.4000.04
1148
1. Cause:
The upstream cold water pressure is too high.
Measure:
Install a central pressure reducing valve as of a
pressure of 4.5 bar.
Fault:
Noise during regeneration
2. Cause:
The noise comes from the domestic installation.
Measure:
Check the domestic installation.
3. Cause:
The pressure reducing valve of the IT 4000 is not
working.
Measure:
Replace the pressure reducing valve (spare part
number 3000.00.917).
1. Cause:
There is a malfunction in the control unit.
Measure:
To reset the device: unplug, press and hold the
manual regeneration button, while plugging in again.
Fault:
The device gets stuck at
some point during regeneration.
2. Cause:
The dynamic pressure has fallen below 2 bar during
regeneration.
Measure:
To reset the device: unplug, press and hold the
manual regeneration button, while plugging in again.
3. Cause:
Power failure during regeneration.
Measure:
To reset the device: unplug, press and hold the
manual regeneration button, while plugging in again.