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Only for training and service purposes
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Features
Is cold water discharged for
more than 3 minutes ?
Start
Operation mode change
to Heating mode
Operate the unit in cooling mode.
Does test operation start?
Refer to part4, 6 electric part
Yes
No
Yes
Refer to part4,  5 cycle part
No
Is hot water discharged ?
After hot start
Yes
No
Is there any temperature 
difference between intake and 
discharged water?  
Yes
No
Is the operating current 
normal ?
Yes
Normal
Refer to Troubleshooting 
Guide
No
* Check the load (In / Out Temp.)
* Check pipe length and amount of 
  refrigerant
* Check for abnormal sound in 
  outdoor unit (comp.,fan, others )