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Carrier · Heat pump

66 Outdoor fan dropped out

Medium severity Carrier Infinity 18VS 25VNA8

What the control is telling you

Amber STATUS light flashes 66. The inverter reports the outdoor fan motor is not running. Type: Event; reset: 6 minutes.

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

Likely causes

  • Fan motor not running
  • 3-ton inverter in test mode (old software)

Test and repair steps

  1. Troubleshoot the outdoor fan motor (resistance between any two of the 3 leads: about 21.2 ohm on sizes 13/24B, 11.1 ohm on the others).
  2. If the inverter entered test mode, replace it with one that has current software.

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Source: Carrier 25VNA8 / 24VNA9 Service Manual, Table 6 Fault Code Actions, p.21. 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.