EA

Indoor/Outdoor Miswiring or Excessive Indoor Units

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

What does EA mean?

The connecting wiring between indoor and outdoor units is either miswired, or the system configuration includes an excessive number of indoor units (four or more). This condition disrupts proper communication and system control, preventing normal operation.

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)