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Carrier · Heat pump

96 DC under voltage lockout

High severity Carrier Infinity 18VS 25VNA8

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 18VS variable speed heat pump 25VNA8 (AOC control + inverter)

Likely causes

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

Test and repair steps

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

Models that show this code

7 models in Carrier Infinity 18VS 25VNA8

25VNA81325VNA82425VNA82525VNA83625VNA83725VNA84825VNA860

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.