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• Replace the light receiving board.
• Replace the control board if other than above.
• Are the sensor's three windows stained?
• Is the sensor's lead wire connector connected?
• Are the sensor's board positions displaced (bottom
light emitting boards, light receiving board)?
• Measure the forward voltages of the LEDs on the
bottom light emitting boards and the photo diode
(PHD) on the light receiving board with a measuring
device that has a diode check function.
* Replace the bottom light emitting boards and the light
receiving board if the measured values are other than
the normal values shown in the table above.
• Replace the display board or the control circuit if other
than above.
1.Lighting board
2.Control circuit
1.Stained sensor's windows
2.Disengaged sensor
3.Displaced sensor's
board positions
4.Sensor light
emitting/receiving
diode failure
5.Control circuit
Phenomenon Cause Check procedure and action to take
Phenomena of problems other than error mode display
Lighting does not turn on.
The hand dryer starts
drying as soon as the
power switch is turned
ON.
Item name Measured value Decision
LED 0.9 to 1.2V Normal
Photo diode 0.5 to 0.8V Normal
– side
+ side
Tester
• Are the sensor's three windows stained? → Clean the
windows if stained.
• Is the sensor's lead wire connector connected?
• Are the sensor's board positions displaced? → Install
the sensor light boards in their proper positions if
displaced (top light emitting boards, light receiving
board).
• Measure the forward voltages of the LEDs on the top
light emitting boards and the photo diode (PHD) on
the light receiving board with a measuring device that
has a diode check function.
* Replace the top light emitting boards and the light
receiving board if the measured values are other
than the normal values shown in the table above.
• Replace the display board or the control circuit if other
than above.
• Are foreign particles being attached to the motor's
fins?
• Is the filter clogged with dust?
1.Stained sensor's
windows
2.Disengaged sensor
3.Displaced sensor's
board positions
4.Sensor light
emitting/receiving
diode failure
5.Control circuit
1.Suction of foreign
particles
2.Filter clogged with dust
The hand dryer does not
stop after removing the
hands.
Abnormal noise is
generated.
Item name Measured value Decision
LED 0.9 to 1.2V Normal
Photo diode 0.5 to 0.8V Normal
– side
+ side
Tester