E9 / Outdoor LED1 flashes 21 times — Internal unit overload in heating mode

What does E9 mean?

The indoor unit is experiencing an overload condition, particularly when operating in heating mode. This is a protective measure to prevent damage.

• Pipe temperature sensor issue
• Indoor PCB issue
• Indoor motor issue (possibly related to fan operation in heating)

Click steps to track your progress.

1. 1

   Ensure air filters are clean and not clogged, as this can lead to the unit working harder.

2. 2

   Check for any blockages in the air intake or output vents of the indoor unit.

3. 3

   Turn off the air conditioner at the main power switch, wait a few minutes, then restart.

4. 4

   If the error recurs, contact a qualified service professional.