VII. TROUBLE SHOOTING PROCEDURES (con’t)
PROBLEM
POSSIBLE CAUSES
SOLUTIONS
Automatic
Backwash Fails to
Cycle
Controller power may
be off or circuit fuses
tripped.
Improper setting of
differential switch.
Actuator
malfunctioning.
1. Be sure wiring is connected correctly.
Replace circuit fuses. Turn on power.
Controller may be faulty and need
replacement.
2. Adjust as necessary.
3. Check connections
Media Sand
Incorrect media sand
(i.e. too fine and too
1. Replace media with proper sized media.
Appears
Downstream
small)
Broken, damaged, or
missing lateral.
2. Repair or replace laterals of the underdrain.
Obstruction in the
valve seat.
Rubber seating is
worn or damaged.
Actuator Diaphragm
damaged.
Linkage out of
adjustment
1. Remove the obstruction.
Backwash Valve
Leaks
2. Replace Valve.
3. Replace diaphragm.
4. Adjust linkage
Water Hammer
Air in tanks.
Long backwash line
causing vacuum.
1. Bleed off trapped air in system. Air vent on
system may be required.
2. Install vacuum breaker on backwash line.
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