Serial signal error indicated — Communication issue or interference

What does Serial signal error mean?

After restarting the power or using the emergency operation switch, the system indicates a serial signal error, usually after about 6 minutes. This suggests a problem with communication between the indoor and outdoor units, or interference from external devices.

• Interference from inverter-controlled lighting equipment
• Miswiring of the indoor/outdoor connecting wire
• Poor contact in the connecting wire terminals
• Wire disconnection in the indoor/outdoor connecting wire

Click steps to track your progress.

1. 1

   Turn OFF any inverter-controlled lighting equipment located near your air conditioner units.

2. 2

   Turn OFF the main power supply to your air conditioner, wait a minute, then turn it back ON.

3. 3

   Press the emergency operation switch on the indoor unit (if your model has one).

4. 4

   Visually inspect the indoor/outdoor connecting wire for any obvious signs of damage, miswiring, or loose connections.

5. 5

   If the error persists, consider reinstalling the unit or moving interfering lights further away, or attaching a filter to the remote control receiving section of the indoor unit if available.