Indoor unit shows E8; unit may stop and not respond to remote; sometimes associated with power supply issues.

Safety: Disconnect power at the breaker. Indoor PCB carries mains voltage; avoid touching tracks and components unnecessarily.

Steps:

• 1. Power reset: Turn off power for at least 10 minutes to fully discharge capacitors. Restore power and check if E8 clears temporarily.
• 2. Inspect indoor PCB: Remove the control box cover. Look for burnt components, bulging capacitors, or signs of moisture damage.
• 3. Check connectors: Reseat all connectors on the indoor PCB, including those to the display board, sensors, and fan motor.
• 4. Verify supply voltage (advanced): A technician can measure the DC output voltages from the PCB's power supply section. If missing or unstable, the PCB is defective.
• 5. Replace indoor PCB: If visual inspection and basic checks indicate PCB failure, replace the indoor main PCB with an Airwell-approved part. Transfer any jumper settings or DIP switch positions from the old board to the new one.
• 6. Surge protection: After replacement, consider installing a surge protector on the supply line to protect the new PCB from future voltage spikes.

Because this fault involves electronic components and mains voltage, professional service is strongly recommended.