41
Installation & Operation Manual | Sigma Pro
Troubleshooting
No.
Symptom
Possible
Causes
Required
Action
1
High or elevated
pressure differential
between upstream
and downstream
Coarse or fine screens are
totally clogged
1.Perform automatic flushing
a.
Close the downstream valve
b.
Start a manual flush cycle using the flushing controller.
c.
Verify that the downstream pressure is equal or slightly lower than the upstream
pressure
d.
If symptom continues and the filter remains clogged, stop the operation and
manually clean the fine screen
2.Perform manual flushing
a.
Extract the course and fine screens. Clean manually with a high pressure wash
before returning to regular operation. Please refer to filter disassembly instruction
on page 21
b.
Verify that the downstream pressure is equal to or slightly lower than the
upstream pressure
2
System flow rate
seems to be lower
than usual
Coarse screens are clogged
Manually clean the coarse screens:
a. Dismantle the coarse screens. Please refer to filter disassembly instruction on page 21
b. Return to regular operation and check
the filter’s performance
3
Frequent/excessive
flush cycles
Water quality has changed
Check the source water quality for poor quality conditions (e.g. flood, heavy rain, works
upstream of intake, new dam)
Controller flush duration set-
point too low (electronic
control)
Check the “Flush Duration”
- set-point 10 seconds
4
The filter
doesn’t flush
automatically
(electronic controller)
Controller batteries are dead, or
power supply is isolated
Check battery status by ADI-P mobile app.
Replace the
controller’s batteries
if needed
The solenoid is set in manual
position
“Manual”
override position.
Switch the solenoid to
“Auto”
position
No pressure on the main
command tube line
Rinse and clean the command line filter (if it exists), otherwise check the finger filter for
blockage and clean as required
The controller is in “Fault” mode
Please see ADI-P controller manual
“DP
F
ault”
parameter is set to an appropriate value
(AMC Controller)
5
The flush valve
remains open
Air in the valve’s command
line
or control tube is disconnected
1. Bleed air from the control tubing
2. Reconnect control tube
3. Replace control tube if damaged
4. Electronic controller
–
check the solenoid, bleed the command line, and verify that the
controller is not in
“Flushing”
mode
The solenoid manual override is
activated
Switch the solenoid to
“Auto”
position
Controller programmed for a
very long flush duration
(electronic controller)
Check the “Flush Duration”
- set-point 10 seconds
Blocked flush port
Remove any blockage from the flush port
