Installer manual Evolio 255 740-760 - Troubleshooting
Ref. MKT-IM-037 / D - 25.10.2021 81 / 90
Issue Cause Solution
Valve will not
draw brine.
Low water pressure. Set pump or pressure regulator to
maintain 1.38 bar (20 psi) dynamic at
softener’s inlet
Restricted drain line. Change drain to remove restriction.
Injector plugged. Clean injector and screen.
Injector defective. Replace injector.
Air check valve closes prematurely on
255 valve.
Put controller momentarily into brine
cycle (C2).
Replace or repair air check if needed.
Debris is flapper 1 preventing
complete opening or flapper 1
damaged.
Check flapper 1, clean seat and
flapper, replace if necessary.
Intermittent or
irregular brine
draw.
Low water pressure. Set pump or pressure regulator to
maintain 1.38 bar (20 psi) dynamic at
softener’s inlet.
Defective injector. Replace injector.
Backwashes or
purges at
excessively low or
high rate.
Incorrect drain control used. Replace with correct size controller.
Foreign matter affecting valve
operation.
Remove drain control and clean ball
and seat.
9.3 System
Issue Cause Solution
Hard water
leakage after
regeneration.
Improper regeneration. Control brine dosage setting and
repeat regeneration.
Leaking of external bypass valve. Replace bypass valve.
O-ring around riser pipe damaged. Replace o-ring.
Incorrect controller settings. Check that controller setting match
with your actual softener model.
System using
more or less salt
than brine setting.
Foreign matter in valve causing
incorrect flow rates.
Remove brine controller and flush out
foreign matter. Then advance
controller to brine cycle (C2) to clean
valve (after so doing controller goes to
"2nd rapid rinse" cycle (C7) to remove
any brine from tank).
Incorrect controller settings. Check that controller setting match
with your actual softener model.
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