E10 Grounding fault / poor neutral connection

What the control is telling you

The control detected a grounding error or a poor neutral connection. The furnace will not operate.

Applies to: Daikin DR96TN (upflow/horizontal) and DD96TN (downflow/horizontal) two-stage 96% furnaces with 9-speed ECM motor, R-32 ready

Likely causes

• Loose or high-resistance neutral connection
• Missing or poor ground path

Test and repair steps

1. Check the neutral wire connection at the furnace junction box, the control board and the panel; tighten or repair.
2. Verify continuity from the furnace to the ground source (ground wire back to the panel).
3. Power off and measure neutral (white) to burner resistance - it should be very low (manual: less than 2 ohms).
4. Restore power and confirm the code clears.

Settings for these units

Normal status displays (7-segment) · Daikin DR96TN/DD96TN

These are normal operating displays, not fault codes.

Models that show this code

13 models in Daikin DR96TN/DD96TN

Other codes on the same units

• E11 Flame rollout switch open
• EE0 Lockout - too many ignition retries (3)
• EE1 Pressure switch closed at start of heating cycle
• EE2 Pressure switch did not close (inducer runs, no ignition)
• EE3 High (primary) limit open
• EE4 Flame sensed with no call for heat
• EE5 Open fuse (short in low voltage wiring)
• EE6 Low flame signal