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Carrier · Air conditioner

46 Brownout

Medium severity Carrier Infinity 19VS 24VNA9Carrier 2-stage 24ANB/25HNB

What the control is telling you

Amber STATUS light flashes 46. Line voltage fell too low (under about 187 V for 4 s). Compressor and fan stop and stay off until voltage is back to at least 190 V. Type: Local; reset: 6 minutes.

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

Likely causes

  • Low supply voltage
  • Bad connection on L1 / L2
  • Inverter not reading voltage correctly

Test and repair steps

  1. Measure line voltage at the unit; it should be above about 180-190 V. If it stays low, contact the utility.
  2. Check line and load side connections on L1 and L2.
  3. If voltage and connections are good, replace the inverter.

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Source: Carrier 25VNA8 / 24VNA9 Service Manual, Table 6 Fault Code Actions, p.19. 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.