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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.

Models that show this code

17 models in Carrier Infinity 19VS 24VNA9, Carrier 2-stage 24ANB/25HNB

24ANB12424ANB13624ANB14824ANB16024ANB72424ANB73624ANB74824ANB76024VNA924VNA91324VNA92424VNA92524VNA93624VNA93724VNA94824VNA94924VNA960

Other codes on the same units

  • 31 High pressure switch open
  • 32 Low pressure trip
  • 33 Lost inverter communication
  • 45 Outdoor control board failure
  • 47 No 230 V at unit
  • 48 Lost inverter communication - lockout
  • 49 Compressor over current
  • 53 Outdoor air temperature sensor fault

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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.