PART IV
TROUBLESHOOTING - NO FAN
E-42
ENGLISH
Check main circuit board
1. Set the ohmmeter at the range of 200V ac.
2. With the ohmmeter, check three speeds output voltages. Make sure the unit is plugged in.
A. Set at Low speed, place the terminals on yellow (com) and black (L) wires, it should read somewhere close to 120V ac. If not,
the main circuit board has problem.
B. Set at Medium speed, the yellow and blue (M) wires should read somewhat close to 120V ac. If not, the main circuit board
has problem.
C. Finally, set at High speed, place the ohmmeter terminals on yellow and red (H), it should read close to 120V ac. If not, the
main circuit board has problem.
1. At Low speed, check the
voltage between L (Black) and C.
C. At High speed, check the
voltage between H (Red) and C.
B. At Medium speed, check the
voltage between M (Blue) and C.
If you are NOT sure if the fan motor wire connection is correct, you can unplug the connection and check the voltage output on
the pins. If the voltages are not 120V ac, you will have to replace then main circuit board.
C. At High speed, check the
voltage between pin 1 and pin 7.
B. At Medium speed, check the
voltage between pin 3 and pin 7.
A. At Low speed, check the
voltage between pin 5 and pin 7.
1. Remove the fan motor panel
after taking off the upper plate.
2. Remove a screw from the
capacitor.
3. Unplug the capacitor wire
plugs from the capacitor (6uf,
250V ac).
Check the motor capacitor and fan motor
If the motor wire output voltages on the main circuit board are correct, you have to go ahead to try to replace the fan motor
capacitor and the fan motor.
1. Remove the upper plate and fan motor front panel.
2. Unscrew a screw on the fan motor capacitor.
3. Unplug capacitor plugs from the capacitor. Install a new capacitor by doing the reverse operation.
When the capacitor is damaged you can hear a
buzzing sound from the fan motor, however if
the fan motor is broken there is no any sound.
Helpful hints
