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Daikin · Furnace

EEE Internal control fault (IRQ loss)

High severity Daikin DR96TN/DD96TN

What the control is telling you

The integrated control board found an internal fault. 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

  • Integrated control board failure
  • Electrical noise or power disturbance

Test and repair steps

  1. Cycle power to the furnace and check whether the code returns.
  2. Check supply voltage (115 V +/- 10%) and grounding.
  3. If the code returns, replace the integrated control board.

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Source: Daikin RSD6612304 (DR96TN/DD96TN service), 2 Stage Troubleshooting Codes, p.28-29. Summarized in our own words; check the original manual for your model.

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For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.