-1-
[Bold] numbers in the description below correspond to the item numbers in the Parts List and exploded
assembly diagram for the Model DH 40MEY.
1. Troubleshooting and corrective action
Perform troubleshooting and take a necessary corrective action according to the table below if there is a
problem that cannot be solved by the corrective action described in the Handling Instructions.
Problem
Cause
Check
Corrective action
All the four LEDs of
the display lamp
are flashing.
• Broken Controller
Set [49]
• No check needed.
• Replace the Controller
Set [49] with a new
one.
Three LEDs of the
display lamp are
flashing.
• Mix-up of three
internal wires of
Stator Sensor
PCB Set [42] and
Controller Set [49]
• Check the heat-shrink tube
colors (red, black, and white)
of internal wires connecting
the Stator Sensor PCB Set
[42] and Controller Set [49].
• Correctly connect
internal wires of the
Stator Sensor PCB Set
[42] and Controller Set
[49] by their tube colors
(red, black, and white).
• Broken Controller
Set [49]
• Check the state of the
Controller Set [49] connector.
• Replace the Controller
Set [49] with a new
one.
• Broken Rotor
[134]
• Check the built-in magnet of
the fan for breaks.
• Replace the Rotor [134]
with a new one.
Two LEDs of the
display lamp are
flashing.
• Broken Controller
Set [49]
• No check needed.
• Replace the Controller
Set [49] with a new
one.
One LED of the
display lamp is
flashing.
• Improperly
connected
connector cable of
the Stator Sensor
PCB Set [42]
• Check the plug-in state of the
connector cable.
(See “Reassembly of the
power supply unit” on page
12.)
• Firmly plug the
connector cable.
• Broken Stator
Sensor PCB Set
[42]
• When the connector cable is
not defective
• Replace the Stator
Sensor PCB Set [42]
with a new one.
• Broken Controller
Set [49]
• Check the plug-in state of the
Controller Set [49] connector.
• Replace the Controller
Set [49] with a new
one.
• Broken Rotor
[134]
• Check the built-in magnet of
the fan for breaks.
• Replace the Rotor [134]
with a new one.
TROUBLESHOOTING GUIDE