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Daikin · Furnace

EAF R-32 sensor communication lost - mitigation mode

High severity Daikin DR96TN/DD96TN

What the control is telling you

The furnace lost communication with the R-32 refrigerant sensor on the indoor coil and went into mitigation mode: gas heat stops and only the fan runs.

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

Likely causes

  • Furnace not paired with an R-32 cooling unit but A2L function still enabled
  • R-32 sensor wire loose or unplugged
  • Damaged sensor wire
  • Failed R-32 sensor

Test and repair steps

  1. No R-32 system with this furnace? Turn the A2L function off: use left/right to reach A2E, press the center button, pick no, then confirm.
  2. Check that the R-32 sensor wire is plugged into the furnace control board and the sensor.
  3. Inspect the sensor wire for damage - it should run with the thermostat wires and away from the flue pipe and hot surfaces.
  4. Replace the R-32 sensor if wiring is good.

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Source: Daikin RSD6612304 (DR96TN/DD96TN service), 2 Stage Troubleshooting Codes, p.28-29; R-32 Information p.10. 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.