Mitsubishi Electric JT-SB216JSH2-W-NE Handbook page 15

Troubles without error display
Symptom
Warm air does not blow.
( JT-SB216JSH2-W/H/S-
NE)
The hand dryer operates
by itself.
The hand dryer does not
stop operation.
Air speed switch does not
change the air volume.
The hand dryer makes
abnormal noises.
Air blow is weak.
Cause
Heater switch Check that the heater switch is turned ON.
(Heater lamp lights with the heater switch ON.)
Connector dis- Check if the connectors TAB3 and TAB4 on the power circuit board
connection for the (JT-30P8H) are disconnected.
heater
Blown thermal Measure the resistance between the connectors TAB3 and TAB4
fuse of the heater on the power circuit board (JT-30P8H).
At a heater temperature of 0°C or over: 100 Ω or under
If the fuse is blown, the resistance will be ∞ Ω.
In this case, replace the heater (PTC) and the power circuit board
(JT-30P8H).
Malfunction of Check that approx. 220 to 240 V AC is output at both ends of the
the power circuit connectors TAB3 and TAB4 on the power circuit board (JT-30P8H).
board (JT-30P8H) If it is not output, replace the power circuit board (JT-30P8H).
*Note: Approx. 220 to 240 V AC is output during operation, and it is
Heater malfunc- If no error is found after checking the above, replace the heater
tion (PTC).
Connector dis- Check if the following connectors are disconnected.
connection for the 1 Sensor circuit board (JT-30S3R) connector CN12
sensors 2 Sensor circuit board (JT-30S2R) (2 locations) connectors CN15
3 Light receiving circuit board (JT-30S1R) connector CN11
4 Control circuit board (JT-30M8A/JT-30M8/JT-30M9A) connec-
tors CN7 and CN8
Malfunction of Visually check the sensor circuit boards for a defect such as a
the sensor cir- crack, corrosion, or a cold solder joint.
cuit boards (JT- If the error persists after replacing the control circuit board (JT-
30S1/2/3R) 30M8A/JT-30M8/JT-30M9A) in the next procedure, replace the
damaged sensor circuit boards (JT-30S1/2/3R).
Malfunction of the If no error is found after checking the above, replace the control
control circuit board circuit board (JT-30M8A/JT-30M8/JT-30M9A).
(JT-30M8A/JT-
30M8/JT-30M9A)
Connector discon- Check if the connector CN21 on the control circuit board (JT-
nection 30M8A/JT-30M8/JT-30M9A) or CN4 on the power circuit board
(JT-30P8H) is disconnected.
Malfunction of If no error is found after checking the above, replace the power
the power circuit circuit board (JT-30P8H).
board (JT-30P8H)
Sucking of foreign Check for any foreign matter sticking to the blower (assembly)
matter vanes.
Clogged filter Check the filter for clogging with dust, etc.
Incorrect wiring Check if the motor lead wires of the blower (assembly) (red to
TAB7, white to TAB8, black to TAB9) are connected to incorrect
TABs on the power circuit board (JT-30P8H).
( If they are connected incorrectly, the motor turns in the reverse
direction.)
Malfunction of If no error is found after checking the above, replace the power
the power circuit circuit board (JT-30P8H).
board (JT-30P8H)
Check Method and Remedy
not output during standby.
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