Mitsubishi Electric GK-2509YS2-CE, Handbook, Page: 8 / 24

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