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Carrier · Heat pump

86 Fan inverter current lockout

High severity Carrier Infinity 18VS 25VNA8

What the control is telling you

Amber STATUS light flashes 86. Outdoor fan motor current kept going too high (elevated from code 63). Type: System malfunction; reset: 5 minutes.

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

Likely causes

  • Sudden supply voltage change
  • Fan blade or motor restricted
  • Intermittent harness plug connection
  • Fan blade bent or out of balance
  • Damaged inverter

Test and repair steps

  1. Investigate incoming voltage.
  2. Check the fan motor and blade turn freely.
  3. Check the harness plug locks positively on the board.
  4. Replace a bent blade; replace the inverter if the fault continues.

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