Carrier · Heat pump

LD1 MOC red LED LD1 (sizes 25-60)

Normal status Carrier Infinity 18VS 25VNA8

What the display is showing

Red LED LD1 on the inverter (MOC) board, sizes 25 to 60. Steady on means the MOC is powered with DC bus at 40 V or more. Off means no power and the capacitor has discharged.

Applies to: Carrier Infinity 25VNA8/24VNA9 inverter board (sizes 25 to 60)

Models that show this code

7 models in Carrier Infinity 18VS 25VNA8

25VNA81325VNA82425VNA82525VNA83625VNA83725VNA84825VNA860

Other codes on the same units

96 DC under voltage lockout
97 DC over voltage lockout
98 High torque event
99 High torque lockout
LD5 MOC green LED LD5 (sizes 25-60)
LED1 MOC red LED1 (sizes 25-60)
LED3 MOC amber LED3 (sizes 25-60)
LED200 MOC red LED (sizes 13, 24B)

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Source: Carrier 25VNA8/24VNA9 service manual, Variable Speed Drive LED Location and Description, p.26-27. Summarized in our own words; check the original manual for your model.

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.