Communication or Indoor Fan Motor Fault

What does 3-time blink 2.5-second OFF mean?

This code signifies one of two distinct issues depending on the operating context: either the serial communication signal from the outdoor unit is not received for up to 6 minutes, or the indoor fan motor's rotational frequency feedback signal is absent for 12 seconds after operation. Both conditions prevent the indoor unit from operating correctly, resulting in a lack of airflow or complete system shutdown. Timely resolution is crucial for proper unit function and comfort.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Inspect the indoor fan motor's speed sensor and its wiring for damage or disconnections, referring to 9-6. 'Check of indoor fan motor'.

2. 4

   Check all communication wiring terminals for secure connections and continuity.