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.

Complete Troubleshooting Guide

1. 1

   If diagnosing a recall (9-2.2), verify indoor/outdoor connecting wire for miswiring and check for serial signal errors by referring to 9-6.

2. 2

   If diagnosing a troubleshooting (9-4) fault, check for physical obstructions preventing the indoor fan motor rotation and verify its power supply.

3. 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'.

4. 4

   Check all communication wiring terminals for secure connections and continuity.