11
SYMPTOM
CAUSE
DIAPHRAGM VALVE REMEDY
(See Valve Disassembly Procedure A)
PISTON-TYPE VALVE REMEDY
(See Valve Disassembly Procedure B)
3.
Valve won't turn off with timer.
A.
When the valve won't turn off
with the timer, the foremost goal is
to stop the flow of water. When this
is accomplished, check steps B
through D for trouble-shooting
procedure.
• Put timer in auto/off (Rain Shutoff) mode. If
watering continues. . .
• Unplug timer. If this stops the watering, the
problem is probably in the timer. If watering
continues. . .
• Turn flow control knob (if there is one) to
lowest flow position. If this does not shut off
the flow completely. . .
• See recommendations at left for diaphragm valve.
• See recommendations at left for diaphragm valve.
• Turn gray flow control ring on valve clockwise
until resistance is felt. This is the lowest flow posi-
tion. If more than one valve is affected or if turning
the flow control does not shut off the flow com-
pletely...
• Turn off manual main shut off valve to
sprinkler system.
• See recommendations at left for diaphragm valve.
B.
Solenoid burned out or plunger
clogged.
• Check solenoid as in 2-C. Check for dirt
impeding the movement of the plunger. To
do this,
turn off the water and remove
power to the solenoid
. Unscrew the
solenoid. Sometimes the plunger inside the
solenoid can become stuck in the upward
position due to dirt in the solenoid. Run water
into the solenoid to dislodge dirt. Push a
piece of wire into the small hole in the re-
tainer at the bottom of the solenoid to see if
the plunger inside will move up and down
freely. If not. replace the solenoid.
• See recommendations at left for diaphragm valve.
C.
Valve closing mechanism stuck
in open position due to debris or
damage.
• See Valve Disassembling Procedure A.
Check small ports for blockage by debris;
rinse and inspect diaphragm and diaphragm
seat for dirt or damage. Replace diaphragm
if damaged.
• Remove piston and check for debris that may be
restricting movement (See Valve Disassembling
Procedure B). If piston is damaged replace with
PRK-100 piston replacement kit.
D.
Damaged or misaligned parts
allow water to leak from valve.
• Check valve body and bonnet for cracks.
Check integrity of seal between body and
bonnet and solenoid and bonnet. Repair or
replace parts as necessary to stop leak.
• Check for crack in actuator or bent o-rings. Re-
place actuator or o-rings to stop leak.
E.
Valve set in "Manual On" mode.
• Depending on the model, you will need to
be sure the solenoid is tightened into the full
clockwise position ("Manual Off") or turn the
bleed screw or knob on top of the valve
clockwise to tighten. See section entitled
"How to Operate."
• Hold gray flow control ring and turn solenoid
clockwise until resistance is felt.
4.
Water leaks out at sprinkler
heads when station is off.
A.
Closing mechanism dirty or
damaged and does not seat prop-
erly.
• See Valve Disassembly Procedure A.
Check small ports for blockage by debris;
rinse and inspect diaphragm and diaphragm
seat for dirt or damage. Replace diaphragm
or valve body if damaged.
• See Valve Disassembly Procedure B. If thor-
oughly cleaning the piston and housing does not
help, replace piston with PRK-100 piston replace-
ment kit.
B.
Valve not fully in "Manual Off"
mode.
• See 3-E above.
• See 3-E above
C.
Solenoid burned out or ob-
structed.
• Turn off water. Remove solenoid. Check for
twisting or damage to solenoid O-ring. Check
solenoid plunger as in 3-B above. Rinse
bottom of solenoid and seating surface in-
side valve. Replace solenoid if damaged.
• See recommendations at left for diaphragm valve.
D.
Low head drainage.
• It is normal for water to temporarily con-
tinue to drain from the piping through the
lowest head on the line. The longer the pip-
ing, and the lower the slope of the pipe, the
longer this will take.
• Same for all types of valves. See recommenda-
tions at left for diaphragm valve
TROUBLESHOOTING GUIDE