HVACopediaCarrier · Heat pump
Curtailment Utility curtailment shown on user interface
What the display is showing
When a utility device opens the UTIL input to shut the system down at peak load, the Infinity user interface shows Curtailment Yes (25VNA8/24VNA9) or Curtailment Active (24ANB/25HNB). Compressor operation is interrupted by design; nothing is broken.
Applies to: Carrier Infinity 25VNA8/24VNA9 variable speed, 24ANB/25HNB two-stage and single-stage communicating outdoor units
Models that show this code
15 models in Carrier Infinity 18VS 25VNA8, Carrier 2-stage 24ANB/25HNB
Other codes on the same units
- LED1 MOC red LED1 (sizes 25-60)
- LED3 MOC amber LED3 (sizes 25-60)
- LED200 MOC red LED (sizes 13, 24B)
- LED207 MOC amber LED (sizes 13, 24B)
- COMM LED Green COMM LED on - communicating
- Charging mode Refrigerant charging mode (25VNA8/24VNA9, communicating)
- ON Amber STATUS LED on solid - standby
- Status code recall Status code recall mode (25VNA8/24VNA9)
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Source: Carrier 25VNA8/24VNA9 service manual, Utility Interface With Infinity Touch Control, p.14; Carrier residential A/C and heat pump service manual 24-25, two-stage control functions, p.55-56. Summarized in our own words; check the original manual for your model.
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.