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Carrier · Air conditioner

95 Compressor over current lockout

High severity Carrier Infinity 19VS 24VNA9

What the control is telling you

Amber STATUS light flashes 95. Compressor current kept going too high (elevated from code 49). 2-hour lockout. Type: System malfunction; reset: 2 hours.

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

Likely causes

  • Outdoor airflow too low or off
  • High superheat - TXV problem
  • Compressor outside its operating range
  • Supply voltage outside the rating plate range
  • Loose or wrong wiring to the compressor
  • Phase imbalance / leads miswired
  • Refrigerant overcharge
  • Damaged inverter or compressor

Test and repair steps

  1. Check the outdoor coil and fan.
  2. Troubleshoot TXV; check the suction pressure transducer and suction sensor.
  3. Check supply voltage against the rating plate and all power / compressor plug connections.
  4. Measure compressor winding resistance (between terminals: about 1.13 ohm sizes 13/24B, 0.59 sizes 25/36, 0.37 sizes 37/48, 0.24 sizes 49/60; over 1 megohm to ground - do not use a megger).
  5. Check the refrigerant charge.
  6. Replace the inverter, then the compressor, only after the above checks.

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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.

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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.