You can check the error history of the air conditioners.

1. Tap (a) on the "Setting" screen to check the error history.
   The screen moves to "Error history."
   
2. Tap (b) to select the air conditioner and check the error history.
   Tap [] to show the registered air conditioners or the subordinate group.
   Tap [] to hide the registered air conditioners or the subordinate group.
   
   
3. The error history of the air conditioner is shown in order of newest to oldest.
   To switch the display order, tap (c).