F27 -05 (outdoor) — Incorrect data transfer between indoor and outdoor unit (outdoor unit side)

What does F27 -05 (outdoor) mean?

Data transfer between the indoor and outdoor units is incorrect, originating from the outdoor unit's side. This indicates a communication issue with the outdoor unit.

• Problem with the outdoor unit's communication board.
• Damaged interconnect cable affecting signal integrity.
• Interference on the communication line.

Click steps to track your progress.

1. 1

   Check the interconnect cable connections on the outdoor unit.

2. 2

   Inspect the cable for any signs of damage.

3. 3

   Ensure the outdoor unit is properly grounded.

4. 4

   Turn off the unit, unplug it, wait 30 seconds, and plug it back in to reset.