Eb

Indoor/Outdoor Miswiring (Converse) or Disconnection

Mitsubishi Electric · Mitsubishi PUZ-HA30-36NHA4 Outdoor Unit

What does Eb mean?

The connecting wiring between the indoor and outdoor units has been miswired (converse wiring) or a disconnection has occurred. This critical fault prevents proper communication and control between the units, leading to system malfunction.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Inspect the indoor controller board for any visible defects or damage.

  2. 4

    Inspect the outdoor controller circuit board for any visible defects or damage.

Source: Mitsubishi PUZ-HA30-36NHA4 Outdoor Unit
Open Manual (Page 61)