Display shows E9 and the unit may not cool or may shut down unexpectedly.

Safety first: Always unplug the unit before inspecting the power cord or control board. Do not bypass fuses or safety devices.

Steps to address E9:

• 1. Check outlet and power source: Plug a lamp or small appliance into the same outlet to confirm stable power. Avoid using lightweight extension cords or power strips.
• 2. Inspect power cord: Examine the STAIGIS power cord for cuts, kinks, or burn marks. Ensure the plug fits snugly in the outlet.
• 3. Reset the unit: Unplug for 10 minutes, then plug directly into a properly grounded wall outlet. If E9 clears and does not return, it may have been a transient power issue.
• 4. Access main control board: If E9 persists, remove the rear or top panel (depending on model) to access the main PCB. Look for burnt components, bulging capacitors, or darkened areas.
• 5. Check board connections: Reseat all harness connectors to the board, ensuring firm contact.

Warning: Component-level repair of the power supply section involves live mains voltage and should only be performed by qualified technicians. If visible board damage is present, replacing the entire "STAIGIS main control board" is usually the safest option.