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13
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Symptom
Cause
Check Method and Remedy
The hand dryer does not
blow warm air.
Malfunction of the
heater switch
After checking that the connector is securely connected, meas-
ure the resistance across the heater switch on the display circuit
board (JT-33D). If the resistance is not normal, replace the dis-
play circuit board (JT-33D).
Switch
Resistance Judgment
ON state
0
Ω
Normal
OFF state
∞
Ω
Normal
Blown thermal
fuse of the heater
Measure the resistance between the heater lead connectors (red
and white).
If it is
∞
Ω
, replace the heater (PTC).
Ambient tempera-
ture is low.
When the ambient temperature is 18°C or lower, the hand dryer,
which is equipped with the simple heater, does not blow suffi-
ciently warm air.
Malfunction of
the power circuit
board (JT-33P)
If the error persists after performing the above, replace the power
circuit board (JT-33P).
Malfunction of
the control circuit
board (JT-33M).
If the error persists after replacing the power circuit board (JT-
33P), replace the control circuit board (JT-33M).
The hand dryer does not
stop blowing air.
Dirt on the sensor
area
Check if the sensor window gets dirty.
Influence of light
Check if the sensor area is exposed to sunlight or strong light.
Malfunction of
the power circuit
board (JT-33P)
If the error persists after performing the above, replace the power
circuit board (JT-33P).
Malfunction of
the control circuit
board (JT-33M)
If the error persists after replacing the power circuit board (JT-
33P), replace the control circuit board (JT-33M).
The air speed can not be
changed.
Malfunction of the
air speed switch
After checking that the connector is securely connected, measure
the resistance across the air speed switch on the display circuit
board (JT-33D). If the resistance is not normal, replace the dis-
play circuit board (JT-33D).
Switch
Resistance Judgment
ON state
0
Ω
Normal
OFF state
∞
Ω
Normal
Malfunction of
the control circuit
board (JT-33M)
If the error persists after performing the above, replace the con-
trol circuit board (JT-33M).
The hand dryer does not
blow air even though hands
are inserted.
Hands are too
far away from the
sensor.
Sensitivity range of the sensor is 8 to 13 cm directly below the
sensor.
When inserting hands, place hands close to the sensor.
Troubles without error display
