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Troubleshooting
Battery-Powered & AC-Powered Flush Valves
Normal Operation: When new batteries are inserted or AC
power is connected or RESET Button is pushed, the lights on
the Printed Circuit Board (PCB) will blink in the following
sequence: Red, Red (with solenoid clicking), Green, Red and
Red. Green light will stay on. When the user enters the sen-
sor beam's effective range, the red light will flash one time
on battery-operated flush valves and will stay on on AC-pow-
ered models. If the user stays in the effective range for more
than 4 seconds and steps away, the valve will activate (1)
Worn batteries are the leading cause of malfunctions.
PROBLEM - FLUSH VALVE WILL NOT FLUSH
POSSIBLE CAUSE
TO DIAGNOSE
Water not turned on
Check water supply
Power supply failure
Check polarity of batteries (or Power
Adapter voltage), and connections.
Batteries are weak.
Red indicator light flashes, no click.
Sensor distance is too short
Stand in front of Flush Valve to
find focal point of sensor beam.
Electronic PCB is defective.
Change batteries (or with Power Adapter
plugged in) push RESET Button.
No light, no action.
Sensor eyes are defective.
Re-insert batteries (or with Power Adapter
plugged in), stand in front of sensor eyes.
If Red indicator light does not blink.
Sensor eye angle too low/too high. Beam not detecting user.
Solenoid Valve is clogged.
Solenoid is clicking but no water.
In-line Filter is clogged
Open clean-out trap, check filter screen.
User time in sensor range
Stand in front of Flush Valve. Red indicator
too short
light does (1) flash.
Solenoid Coil is defective.
Insert new batteries (or with Power Adapter Replace solenoid coil. Push RESET Button.
plugged in), push RESET Button.
Light blinks but no solenoid clicking.
PROBLEM: FLUSH VALVE WILL NOT SHUT OFF
Solenoid is dirty
Solenoid valve is normally closed. Turn off
water and activate flush valve. Clicking
sound means the solenoid is dirty.
If there is no clicking sound......
flush cycle. The flush valve unit will automatically reset for
the next user. When the manual OVERRIDE Button is pushed,
the flushing mechanism will be activated without impacting
the mode of automatic operation. On battery operated mod-
els, the red indicator light flashes when batteries are low.
Please note: Always push the RESET Button
BEFORE diagnosing any problem and AFTER
taking a corrective action.
REMEDY
Turn water on.
Replace batteries (or Power Adapter), re-connect.
Push RESET Button.
Replace batteries and push RESET Button.
To adjust sensor distance out, turn
adjustment clockwise. Push RESET Button.
Replace PCB. Push RESET Button.
Replace sensor eyes and cable.
Disassemble control unit, rotate lens up/down
with finger.
Clean solenoid and blow free all by-pass holes.
Replace Control Disc. Push RESET Button.
Clean or replace filter screen.
Stand in sensor for more than 4 seconds,
then move away.
then replace solenoid valve.
Sensor eye cable
Solenoid pin
pin connector
connection
Indicator light
(Red)
Indicator light
(Green)
Reset button
Sensor Operated Flush Valves
Dip Switch Settings - Push reset button on PC board after any dip switch adjustments
Diagram
Flushing Volume (Time) Water Closet or Urinal
#
Moen Model
Flush Time GPF
1
Urinal Factory pre-set
8315*
1 SEC
2
Urinal Factory pre-set 8312* 8314* 8312R10* 2 SEC
3
Urinal Factory pre-set
8312R15*
3 SEC
4
Closet factory pre-set
8311*
2.5 SEC
5
Closet Factory pre-set
8310* 8310R16*
3 SEC
6
Closet Factory pre-set
8310R35*
7 SEC
* Includes AC models
1
2
3
4
5
6
ON
OFF
1 Second Flush - 0.5 GPF
3 Second Sensor Arming Time
1
2
3
4
5
6
ON
OFF
3 Second Flush - 1.5 GPF
3 Second Sensor Arming Time
1
2
3
4
5
6
ON
OFF
3 Second Flush - 1.6 GPF
4 Second Sensor Arming Time
*1.6 gpf setting available only on models manufactured after 2009.
Adjusting Settings
AC power adapter
pin connector (Red)
Sensor Distance
Battery holder pin
Adjustment
connector (Red)
AC/DC Switch
Batter holder pin
Dip switch
connector (Red)
Sensor Arming Time
(Sensing Time Required For Flush)
SW 1 SW 2 SW 3 SW 4
SW 5 SW 6 SW 7 SW 8 Arming Time
0.5
ON
ON
ON
ON
OFF
OFF
1.0
ON
ON
ON
OFF
OFF
OFF
1.5
ON
ON
OFF
ON
OFF
OFF
1.28
OFF
OFF
OFF
OFF
ON
OFF
1.6
ON
ON
OFF
ON
ON
OFF
3.5
ON
OFF
OFF
ON
ON
OFF
7
8
1
2
3
4
5
2 Second Flush - 1.0 GPF
3 Second Sensor Arming Time
7
8
1
2
3
4
5
2.5 Second Flush - 1.28 GPF
4 Second Sensor Arming Time
7
8
1
2
3
4
5
7 Second Flush - 3.5 GPF
4 Second Sensor Arming Time
OFF
ON
3 SEC
OFF
ON
3 SEC
OFF
ON
3 SEC
OFF
OFF
4 SEC
OFF
OFF
4 SEC
OFF
OFF
4 SEC
6
7
8
6
7
8
6
7
8
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