E9 error, unit may not respond to remote or may shut down unexpectedly

Safety first: Disconnect power before accessing internal electronics.

• Step 1 – Hard reset:
  • Unplug the unit for at least 15 minutes.
  • Press and hold the ON/OFF and MODE buttons together for 10 seconds (if supported by your model) while plugging back in to perform a factory reset.
• Step 2 – Check power quality:
  • Avoid using the unit on circuits shared with heavy appliances that cause voltage dips.
  • Consider using a surge protector rated for air conditioners.
• Step 3 – Replace main PCB:
  • If E9 persists, the internal memory on the Main Control PCB is likely corrupted.
  • Order a replacement board pre-programmed for your exact Pro Breeze model.
  • Label all connectors, swap the board, and reassemble.

Firmware reprogramming in the field is generally not supported for consumer units; board replacement is the standard remedy.