02/21
Model VRKHO6
Page 3 of 4
SENSOR/SOLENOID TROUBLESHOOTING
PROBLEM
REPAIR CHECKLIST
1. Insufficient bubbler flow.
a.
Check that screwdriver stop is wide open.
Direction can be counterclockwise or
clockwise depending on style of shut-off valve.
b.
Verify minimum 30 psi supply pressure.
c.
Clean inlet strainer (if one is present).
3. No bubbler flow
– red light in the
sensor does not flash once when
user
’s hands are within the
sensor
’s range
a.
b.
Unit is in Security Mode.
Sensor is picking up reflections from a foreign
object. Eliminate the source of reflection.
4. No bubbler flow
– red light in the
sensor flashes once when user
’s
hands are within sensor range.
a.
b.
c.
d.
Connectors between electronic unit and
solenoid are disconnected. Reconnect the
connectors.
Debris or scale in solenoid. Shut off water and
power. Unscrew solenoid, pull out the plunger
and spring from the solenoid and clean them.
Use scale remover if needed. When replacing
the plunger, ensure the spring is oriented
vertically.
The central orifice in the diaphragm is plugged
or the diaphragm is torn. Clean the orifice or
replace the diaphragm.
The water supply pressure is higher than 115
psi. Reduce the supply water pressure.
4. Continuous bubbler flow
– sensor
flashes once when user
’s hands
are within the sensor
’s range.
a.
Debris or scale in solenoid diaphragm. Clean
the orifice or replace diaphragm per 4b-c.
5. Continuous bubbler flow
– red light
in the sensor does not flash once
when user
’s hands are within
sensor range.
a.
b.
Sensor is dirty or covered. Clean or eliminate
case of interference. In this event, the security
time will stop flow.
Sensor is picking up reflections from the
washbasin or another object. Decrease the
range or eliminate the cause of reflection.
6. Repeated clogs in strainer.
a.
Install water filter in supply line.
7. Bubbler does not activate.
a.
Check wiring harness. Replace if necessary.
b.
Check solenoid valve. Replace if necessary.
c.
Replace sensor.
d.
Check transformer for 9V at output terminals;
replace if necessary.
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®
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– All Rights Reserved
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®
and other trademarks used
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