Carrier · Air conditioner

96 DC under voltage lockout

High severity Carrier Infinity 19VS 24VNA9

What the control is telling you

Amber STATUS light flashes 96. Inverter DC voltage kept dropping too low (elevated from code 92). Type: System malfunction; reset: 2 hours.

Applies to: Carrier Infinity 19VS variable speed air conditioner 24VNA9 (AOC control + inverter)

Likely causes

Low supply voltage (under about 197 VAC)
Inverter internal damage

Test and repair steps

Measure supply voltage at the outdoor unit; if low, contact the utility.
Replace the inverter if supply voltage is normal.

Models that show this code

9 models in Carrier Infinity 19VS 24VNA9

24VNA924VNA91324VNA92424VNA92524VNA93624VNA93724VNA94824VNA94924VNA960

Other codes on the same units

86 Fan inverter current lockout
88 Compressor / inverter lockout
91 Inverter DC over voltage (event)
92 Inverter DC under voltage (event)
95 Compressor over current lockout
97 DC over voltage lockout
98 High torque event
99 High torque lockout

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Source: Carrier 25VNA8 / 24VNA9 Service Manual, Table 6 Fault Code Actions, p.25. 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.