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Carrier · Air conditioner

88 Compressor / inverter lockout

High severity Carrier Infinity 19VS 24VNA9

What the control is telling you

Amber STATUS light flashes 88. The compressor kept failing to start (elevated from code 79). 2-hour lockout. Type: System malfunction; reset: 2 hours.

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

Likely causes

  • Inverter heat sink fins blocked
  • Condenser airflow too low (outdoor coil)
  • Evaporator airflow too low (indoor coil)
  • High load at very hot outdoor conditions, or overcharge
  • Damaged inverter

Test and repair steps

  1. Clean the inverter fins.
  2. Check both coils for dirt or ice and check both fans.
  3. Check the refrigerant charge.
  4. Replace the inverter if the above are good.

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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.