FieldBench
Daikin codes

Daikin

EA

Lockout

Reversed polarity / ground

115 V L1/N reversed, 24 V transformer reversed, or poor chassis ground.

Walk EA in Diagnose

4 plates — walk the one on the cabinet

First check

1 Hot and neutral at the IFC, not the disconnect

On Daikin DM80VC polarity/ground is measured at the board. A correctly landed disconnect with a swapped whip at the IFC still throws this. Hot/neutral at the IFC, not just the disconnect.

Expect: L1 hot, N neutral, ~120 VAC L1 to N, ~0 VAC N to ground.

The rest of the walkthrough is Diagnose.

On the plates

  • Hot/neutral at the IFC, not just the disconnect.
  • Burner box ground screw.
  • Hot/neutral at the IFC.

Plates that use EA

Same number, other makers

EA on Daikin is not the same code on these plates.