Red Off, Green 4 Flashes (Single System) — Forward Communication Failure at Startup

What does Red Off, Green 4 Flashes mean?

The green LED light on the indoor unit flashes four times while the red LED is off. This indicates that the forward communication between the indoor and outdoor units failed when the system started.

• Break or fault in the communication wiring.
• Interference affecting the communication signal.
• Malfunction of the indoor or outdoor unit's communication module.

Click steps to track your progress.

1. 1

   Switch off the air conditioner at its main power source.

2. 2

   Wait for approximately 30 seconds before switching the power back on.

3. 3

   Examine the interconnecting wiring for proper connections and signs of damage.

4. 4

   If the problem persists, schedule a service appointment with an HVAC specialist.