─
15
─
Symptom
Cause
Check Method and Remedy
Warm air does not blow.
( JT-SB216JSH2-W/H/S-
NE)
Heater switch
Check that the heater switch is turned ON.
(Heater lamp lights with the heater switch ON.)
Connector dis-
connection for the
heater
Check if the connectors TAB3 and TAB4 on the power circuit board
(JT-30P8H) are disconnected.
Blown thermal
fuse of the heater
Measure the resistance between the connectors TAB3 and TAB4
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
the power circuit
board (JT-30P8H)
Check that approx. 220 to 240 V AC is output at both ends of the
connectors TAB3 and TAB4 on the power circuit 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
not output during standby.
Heater malfunc-
tion
If no error is found after checking the above, replace the heater
(PTC).
The hand dryer operates
by itself.
The hand dryer does not
stop operation.
Connector dis-
connection for the
sensors
Check if the following connectors are disconnected.
1
Sensor circuit board (JT-30S3R) connector CN12
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
the sensor cir-
cuit boards (JT-
30S1/2/3R)
Visually check the sensor circuit boards for a defect such as a
crack, corrosion, or a cold solder joint.
If the error persists after replacing the control circuit board (JT-
30M8A/JT-30M8/JT-30M9A) in the next procedure, replace the
damaged sensor circuit boards (JT-30S1/2/3R).
Malfunction of the
control circuit board
(JT-30M8A/JT-
30M8/JT-30M9A)
If no error is found after checking the above, replace the control
circuit board (JT-30M8A/JT-30M8/JT-30M9A).
Air speed switch does not
change the air volume.
Connector discon-
nection
Check if the connector CN21 on the control circuit board (JT-
30M8A/JT-30M8/JT-30M9A) or CN4 on the power circuit board
(JT-30P8H) is disconnected.
Malfunction of
the power circuit
board (JT-30P8H)
If no error is found after checking the above, replace the power
circuit board (JT-30P8H).
The hand dryer makes
abnormal noises.
Air blow is weak.
Sucking of foreign
matter
Check for any foreign matter sticking to the blower (assembly)
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
the power circuit
board (JT-30P8H)
If no error is found after checking the above, replace the power
circuit board (JT-30P8H).
Troubles without error display
