Error 15 — Communication fault between indoor and outdoor unit

Was bedeutet 15 ?

The outdoor unit control board cannot communicate with the indoor unit control board. This can be caused by wiring issues or a faulty PCB.

• Bad communication wiring
• The PCB is bad
• Incomplete or inadequate ground

Klicken Sie auf Schritte, um Ihren Fortschritt zu verfolgen.

1. 1

   Ensure communication cable connections (terminals 3/C and 1) are tight and on the correct terminals.

2. 2

   Check that the communication cable (14/4 stranded copper) is not spliced and PCB connections at CN21 are good.

3. 3

   Verify the ground connection.

4. 4

   Check for proper voltage between communication 3 and N at indoor and outdoor terminal blocks.

5. 5

   Replace the communication wire if ok.

6. 6

   Replace the PCB if the issue persists.