Troubleshooting:
Free up, replace any broken 
parts so fan spins freely
Shut OFF the power supply. 
Rotate the Indoor fan by hand.           
Does the fan rotate freely?
No
Yes
With power still OFF, open 
ODU, remove top cover 
and  top control box cover.
Dr. Smart 
Display
38MAQB18~30K Outdoor Unit
Locate Fan Harness
Continued on next page
Outdoor Fan Error – F5 (page 1 of 2) 
Indoor Unit or Wired Control Display 
Dr. Smart Display (Debugger) 
Malfunction decision conditions
When the Outdoor fan speed is too slow (300 RPM 
or less) for 3 minutes or more, the unit stops and 
the LED displays the Error Code for 30 seconds. 
Then retries until locks out.
• Wiring mistake 
• Fan motor faulty 
• PCB faulty
Troubleshooting:
Error may only displayed every 3 minutes, during this time you may 
see either “normal display” or “88” on indoor unit or wired control.
1 - Red
3 - Black
4 - White
5 - Yellow
6 - Blue
Follow the “1st Steps for DLS Troubleshooting” 
in the beginning of this guide, if you have an 
active error, procedure below.