FieldBench
Mitsubishi codes

Mitsubishi

E8 / U2

Lockout

Overcurrent / high load

Compressor or outdoor protection.

Walk E8 / U2 in Diagnose

3 plates — walk the one on the cabinet

First check

1 Let it cool, then read the drive LED

On Mitsubishi MSZ-FS overcurrent / overheat is often a dirty coil, a failed OD fan, or a locked compressor — not a dead inverter. Clear airflow, confirm the OD fan, and read the drive LED before you order a control. Winding/ground, coil, charge. Weigh-in.

Expect: OD fan running. Coil clean. Drive LED decoded from THIS outdoor’s card.

The rest of the walkthrough is Diagnose.

On the plates

  • Winding/ground, coil, charge. Weigh-in.
  • Winding/ground, coil, weigh-in.
  • Winding/ground, outdoor coil, all indoor coils/filters.
  • Charge: weigh-in + indoor adders. A starved MXZ looks like U2.
  • One indoor locked/flooding can load the outdoor — isolate.

Plates that use E8 / U2