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Carrier · Heat pump

75 Maximum power mode - temperature

Medium severity Carrier Infinity 18VS 25VNA8

What the control is telling you

Amber STATUS light flashes 75. The inverter is running hot so it temporarily lowers speed or stage. Type: Local; reset: None.

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

Likely causes

  • Heating: Indoor airflow too low or off
  • Cooling: Outdoor airflow too low or off - coil blocked or fan problem
  • Inverter heat sink fins blocked
  • Installation outside the application guideline

Test and repair steps

  1. Check indoor airflow (heating) and the outdoor coil and fan (cooling).
  2. Clean the inverter heat sink fins.
  3. Check the installation against the application guideline.

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Source: Carrier 25VNA8 / 24VNA9 Service Manual, Table 6 Fault Code Actions, p.22. 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.