Unit shows E6 and may not respond properly to remote or control commands; sometimes fan runs but mode cannot be changed.

Safety: Disconnect power before opening the control panel.

• Reset control: Unplug the Soleus Air AC for 5–10 minutes to fully discharge the control board. Plug back in and test. If E6 returns, proceed to inspection.
• Access control panel: Remove the front bezel or top cover to expose the display/control board. On portable units, this is usually on the top; on window units, at the front.
• Check harness connections: Locate the multi-pin harness that runs from the display board to the main PCB. Unplug and firmly reconnect both ends. Look for bent pins, corrosion, or partially seated connectors.
• Inspect for damage: Examine both boards for burn marks, cracked solder joints, or water intrusion. If the unit has been exposed to moisture, corrosion may be present.
• Test operation: Reassemble enough to safely power the unit and test. If E6 persists and wiring is intact, the display board or main PCB is likely defective.
• Replace faulty board: Order the correct Soleus Air control PCB or display PCB for your model. Transfer any wiring one connector at a time to avoid miswiring. Mount the new board securely and reassemble.