FieldBench
Daikin codes

Daikin

E8

Lockout

High-stage PS stuck closed

High-fire switch is made with the inducer not on high. Furnace may stay on low.

Walk E8 in Diagnose

3 plates — walk the one on the cabinet

First check

1 Unplug the switch with the inducer off

On Daikin DM80VC this code is the switch made when the inducer is not running. Unplug that switch only. This is Category I metal vent. There is no 96% collector or PVC trap to prime.

Expect: Code changes when the harness is open.

If fail: Wrong switch, or the IFC input is shorted.

If pass: Switch/hose path. Go to step 2.

The rest of the walkthrough is Diagnose.

On the plates

  • This is the second switch — not E1.
  • Welded HPS or water in the high hose.
  • W2 shorted so the IFC thinks it is already on high.
  • This is Category I metal vent. There is no 96% collector or PVC trap to prime.
  • Cap, liner, common-vent tables, inducer wheel, hose on the inducer housing.

Plates that use E8

Same number, other makers

E8 on Daikin is not the same code on these plates.