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Daikin · Furnace

EE4 Flame sensed with no call for heat

Critical severity Daikin DR96TN/DD96TN

What the control is telling you

The control sees a flame signal when the gas valve should be closed. The inducer and circulator blower run continuously and 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

  • Short to ground in the flame sensor or its wiring
  • Lingering burner flame
  • Gas valve closing slowly or leaking through

Test and repair steps

  1. Warning: if a flame is actually present with no call for heat, shut the manual gas valve immediately.
  2. Look into the burner compartment if there is no flame, the signal is false - check the flame sensor wire and insulator for a short to ground and repair it.
  3. If a flame lingers after the call ends, the gas valve is not closing properly - replace the gas valve.
  4. After repair, cycle power and confirm the inducer and blower stop at the end of the post-purge and fan-off delay.

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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.