E9 appears on the display; unit may shut down or refuse to start cooling.

Safety: Unplug the air conditioner before any disassembly.

Steps:

• Power reset: Disconnect power for at least 10 minutes to allow capacitors to discharge and the control to fully reset. Plug back in and test.
• Check power quality: Ensure the unit is plugged directly into a properly grounded outlet of the correct voltage and amperage. Avoid extension cords or power strips.
• Inspect control board: Remove the front panel to access the main PCB. Look for burnt components, corrosion, or insect damage.
• Surge protection: If E9 occurred after a storm or outage, consider using a surge protector once the unit is repaired or replaced.

Important: An E9 code almost always indicates a failed main control PCB. Replacement requires ordering the exact Hotpoint board and transferring all connectors carefully. If you are not experienced with electronics, have a technician perform this repair.