Daikin · Furnace

EbU Unexpected circulator current - hard lockout

High severity Daikin DR96TN/DD96TN

What the control is telling you

During inducer pre-purge (before the blower should run) the main blower motor draws more current than expected. The furnace stops and goes to hard lockout.

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 motor wiring
Line voltage wires to the control and blower motor reversed

Test and repair steps

Power off and check the blower motor wiring connections for looseness.
Check that line voltage to the control and main blower motor isn't swapped; fix it to match the wiring diagram.
Reset by cycling power and check that the blower stays off during pre-purge.

Settings for these units

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

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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.

Homeowner looking at this code? See what it means for you and when to call a technician.

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.