FieldBench
Daikin codes

Daikin

L5 / E6

Lockout

Compressor / drive

Inverter overcurrent (L5) or compressor start fail (E6). Inverter-SKU language.

Walk L5 / E6 in Diagnose

Sign in for the next measurement

First check

1 Let it cool, then read the drive LED

On Daikin DZ20VC 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. Confirm this cabinet is actually the inverter (DZ20VC), not a two-stage DX18TC.

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

The rest of the walkthrough is Diagnose.

On the plates

  • Confirm this cabinet is actually the inverter (DZ20VC), not a two-stage DX18TC.
  • Winding/ground, inverter heat sink/cooling, supply voltage.
  • Weigh-in vs nameplate + line-set. You do not ‘top off’ an inverter to clear L5.
  • Seized compressor vs drive — prove windings and charge before you condemn the PCB.

Plates that use L5 / E6