HVACopediaCarrier · Heat pump
COMM LED Green COMM LED on - communicating
What the display is showing
The green COMM LED on the outdoor control board shows the state of communication with the Infinity control. It stays off until communication is established, turns on steadily once a valid command is received, and goes off again if nothing valid arrives for 2 minutes. It is also off with a standard non-communicating thermostat. If it stays off when communication is expected, inspect the user interface wiring, the indoor and outdoor units and their power.
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, Carrier single-stage communicating HP
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)
- Charging mode Refrigerant charging mode (25VNA8/24VNA9, communicating)
- Curtailment Utility curtailment shown on user interface
- Forced defrost Forced defrost (short the defrost pins)
- ON Amber STATUS LED on solid - standby
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Source: Carrier 25VNA8/24VNA9 service manual, Table 6 Fault Code Actions (status rows), p.15-16; Carrier residential A/C and heat pump service manual 24-25, Table 14 Status Codes (single-stage communicating HP), p.50-51; Carrier residential A/C and heat pump service manual 24-25, Table 18 Troubleshooting (2-stage 24ANB/25HNB), p.60-61. 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.