No, these two codes are triggered by automatic timers and are simply just reminders that it's time to carry out maintenance on the indoor head unit's air filter:
• "CL" - This is displayed every 240 hours of use and is a reminder to remove and clean the air filter.
• "nF" - This is displayed every 2,880 hours of use and is a reminder to replace the air filter with a new one.
Once you have taken the appropriate action based on which of the two codes is displayed, you must manually reset the code by doing the following:
• Press the "LED" button on your remote control 4 times, or press the "Manual Control" button 3 times.
• If the manual reset is not carried out, the code will continue to display every time you restart the unit.