HVACopedia

Carrier · Heat pump

82 Suction over temperature lockout

High severity Carrier Infinity 18VS 25VNA8

What the control is telling you

Amber STATUS light flashes 82. Suction temperature too high repeatedly (elevated from code 72). 4-hour lockout. Type: System malfunction; reset: 4 hours.

Applies to: Carrier Infinity 18VS variable speed heat pump 25VNA8 (AOC control + inverter)

Likely causes

  • Cooling: Undercharged system
  • Cooling: Uninsulated vapor line
  • Cooling: Indoor TXV problem
  • Heating: Undercharged system
  • Heating: Outdoor EXV problem
  • Reversing valve bypassing

Test and repair steps

  1. Cooling check subcooling in Charging Mode (or the subcooling chart on the control box door) and adjust charge (add charge if low).
  2. Insulate the vapor (suction) line.
  3. Troubleshoot the indoor TXV (cooling) or the outdoor EXV (heating).
  4. Heating compare pressures with the heating check chart; if they do not match, recover, evacuate and weigh in the rating plate charge.
  5. Troubleshoot the reversing valve for bypass.

Save it for the next call

Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.

Open the app

Source: Carrier 25VNA8 / 24VNA9 Service Manual, Table 6 Fault Code Actions, p.23. 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.