E5 / 2 Red Flashes - Communication error during operation

What does E5 / 2 Red Flashes mean?

The remote control displays E5, and the indoor unit's red LED flashes twice (while the green LED keeps flashing). This indicates a communication error between the indoor and outdoor units during operation.

• Poor connection or disconnection of wires between indoor-outdoor units
• Noise affecting communication between units
• CPU runaway on the outdoor unit control PCB
• Defective outdoor unit control PCB or a blown fuse

Click steps to track your progress.

1. 1

   Turn off the air conditioner at the main power breaker, wait 30 seconds, and then turn it back on to reset the system.

2. 2

   Visually inspect the connection wires between the indoor and outdoor units for any signs of damage or loose connections.

3. 3

   If the error persists after a power reset, contact a service technician to check for wire integrity, noise interference, or a faulty outdoor unit control PCB/fuse.