Mitsubishi Electric JT-MC106G-W-NA Handbook page 14

Troubles without error display
Symptom
The hand dryer does not
blow warm air.
The hand dryer does not
stop blowing air.
The sensor lights ON/OFF
cannot be switched.
The hand dryer does not
blow air even though hands
are inserted.
Cause
Malfunction of the After checking that the connector is securely connected, meas-
heater switch ure the resistance across the heater switch on the display circuit
board. If the resistance is not normal, replace the display circuit
board.
ON state
OFF state
Blown thermal Measure the resistance between the heater lead connectors (red
fuse of the heater and white).
If it is ∞ Ω, replace the heater (PTC).
Ambient tempera- When the ambient temperature is 18°C or lower, the hand dryer,
ture is low. which is equipped with the simple heater, does not blow suffi-
ciently warm air.
Malfunction of If the error persists after performing the above, replace the power
the power circuit circuit board.
board
Malfunction of If the error persists after replacing the power circuit board, re-
the control circuit place the control circuit board.
board
Dirt on the sensor Check if the sensor window gets dirty.
area
Influence of light Check if the sensor area is exposed to sunlight or strong light.
Malfunction of If the error persists after performing the above, replace the power
the power circuit circuit board.
board
Malfunction of If the error persists after replacing the power circuit board, re-
the control circuit place the control circuit board.
board
Malfunction of the After checking that the connector is securely connected, meas-
sensor switch ure the resistance across the switch (SW1) on the display circuit
board. If the resistance is not normal, replace the display circuit
board.
ON state
OFF state
Malfunction of If the error persists after performing the above, replace the con-
the control circuit trol circuit board.
board
Hands are too Sensitivity range of the sensor is 8 to 13 cm directly below the
far away from the sensor.
sensor. When inserting hands, place hands close to the sensor.
The sensor switch Turn on the sensor switch.
is turned off.
(The sensor OFF
light is lit.)
Check Method and Remedy
Switch Resistance Judgment
0 Ω
∞ Ω
Switch Resistance Judgment
0 Ω
∞ Ω
─ 14 ─
Normal
Normal
Normal
Normal