Troubleshooting; Service Flowchart - Mitsubishi Electric GK-2509YS2-CE Handbook

7. Troubleshooting

Work precautions
• When servicing, recreate the malfunction two or three times before starting repairs.
• When servicing, always keep proper footing.
• When servicing, always unplug the power cord from the outlet, or turn off the circuit breaker. Pay sufficient
attention to avoid electric shock or injury.
• Always connect the power wires properly.
The part names in the text are standardized with the part names in the parts catalog. (There are some
exceptions.)

7-1 Service flowchart

Is the circuit breaker turned on?
When using an external ON/OFF switch, is the
switch turned on?
Is the ON/OFF switch on the product turned on?
Is the rated power supplied to the product?
Is the wiring correct?
Is any foreign matter attached to the propeller fans?
Do any of the propeller fans contact with the orifice?
Are the motors properly insulated?
Are any of the thermal fuses of the motor blown?
Are the motors conducted?
Rotation failure
Yes
Yes
Yes
Yes
Yes
No
No
Yes
No
Turn on the circuit breaker.
No
Turn on the external ON/OFF switch.
No
Turn on the ON/OFF switch.
No
Supply the rated power to the product.
No
Carry out the wiring correctly.
No
Remove the foreign matter.
Yes
Check the propeller fans and orifices, and
replace any deformed components.
Yes
Replace the motors.
No
Replace the motors.
Yes
Replace the motors.
No
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