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

What does F27 -05 mean?

Communication data between the indoor and outdoor units is not being transferred correctly, originating from the indoor unit side. This could be a signal issue or wiring problem.

• Poor signal quality between units.
• Wiring issue on the indoor unit's side of the connection.
• Malfunction of the indoor unit's communication board.

Click steps to track your progress.

1. 1

   Ensure the interconnect cable between indoor and outdoor units is properly connected.

2. 2

   Check for any damage to the cable or connectors.

3. 3

   Minimize potential sources of signal interference.

4. 4

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