Gree Error Code Outdoor comm light blinking: Outdoor communication light blinking (normal) (Heat Pump)

Updated October 15, 2026 · by Aurora Star Tech Inc.

Gree error code Outdoor comm light blinking on a heat pump means: Outdoor communication light blinking (normal). It is also called Gree diagnostic code Outdoor comm light blinking.

Low severityHeat PumpGree Vireo GEN3

Homeowner? What Gree code Outdoor comm light blinking means for you

Usually minor Your heat pump is reporting: Outdoor communication light blinking (normal). This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

Safe things you can check yourself

Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
Check both breakers and the outdoor disconnect box beside the outdoor unit; all should be ON.
Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
In winter, keep snow and ice off and away from the outdoor unit. A short defrost cycle with steam is normal.
Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Gree error code Outdoor comm light blinking mean?

At power-up the outdoor communication light blinks as a normal sign that data is flowing; after each good group of signals the blinking pauses for about 0.2 to 0.3 s. A light that stays on permanently means there is no communication, and a light that is on 1 s and off 1 s means another outdoor unit has a fault.

Applies to: Vireo GEN3 9-24k (3VIR..HP115/230V1A)

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Gree models that use code Outdoor comm light blinking

3VIR09HP115V1A 3VIR09HP230V1A 3VIR12HP115V1A 3VIR12HP230V1A 3VIR18HP230V1A 3VIR24HP230V1A

Other Gree Heat Pump codes

Code	Meaning
nU	Cancel indoor long-distance shielding (factory function)
oC	Commissioning step passed (OK)
oE	Undefined outdoor unit error
oF	Debugging finished / standby
on	Valve test running / unit started
Operation lamp	Operation lamp lit (power on / standby)
P0	Compressor minimum-frequency test display
P1	Compressor rated (nominal)-frequency test display
P2	Compressor maximum-frequency test display
P3	Compressor intermediate-frequency test display
P4	Compressor drive PFC protection
P5	Compressor phase overcurrent

All Gree Heat Pump error codes →

Gree code Outdoor comm light blinking: homeowner questions

What does Gree code Outdoor comm light blinking mean?

Outdoor communication light blinking (normal). At power-up the outdoor communication light blinks as a normal sign that data is flowing; after each good group of signals the blinking pauses for about 0.2 to 0.3 s. A light that stays on permanently means there is no communication, and…

Is it safe to keep using my heat pump with code Outdoor comm light blinking?

Usually yes. Code Outdoor comm light blinking is normally minor, but if it keeps coming back have it checked.

Can I reset Gree code Outdoor comm light blinking myself?

You can try one reset (power off for 30 seconds, then on). If Gree code Outdoor comm light blinking comes back, the cause is still there and a licensed technician should check it.

Who can fix Gree code Outdoor comm light blinking near me?

Aurora Star Tech Inc. repairs Gree heat pumps in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: AC Running But Not Cooling: What to Check · Heat Pump Not Heating or Blowing Cold Air

Troubleshooting guides

Cap the maximum output (function n4) Gree · Heat Pump
Compressor will not run - Gree ductless Gree · Heat Pump
Force a defrost cycle from the remote Gree · Heat Pump
Force a defrost from the outdoor board (function n3) Gree · Heat Pump
Limit the whole system to heating, cooling or fan only (function A6) Gree · Heat Pump
Louver will not swing - Gree ductless Gree · Heat Pump
Noise or vibration - Gree ductless Gree · Heat Pump
Offset indoor engineering numbers (function n5) Gree · Heat Pump
Outdoor fan will not run - Gree ductless Gree · Heat Pump
Read live running parameters of an outdoor module (function n7) Gree · Heat Pump
Read or clear the fault history (function n6) Gree · Heat Pump
Restore system defaults from the outdoor board (0C) Gree · Heat Pump
Run the outdoor commissioning sequence (steps 01 to 17) Gree · Heat Pump
Set automatic energy saving (function n0) Gree · Heat Pump
Set outdoor silence mode (function A7) Gree · Heat Pump
Show indoor engineering numbers on the indoor units (function n8) Gree · Heat Pump
Start pump-down (refrigerant recycle) mode, function A2 Gree · Heat Pump
Start vacuum mode for evacuating pipework (function A8) Gree · Heat Pump
Unit will not start - Gree ductless Gree · Heat Pump
View the stored malfunction code on the remote (LIGHT x6) Gree · Heat Pump
Water leaking from indoor unit - Gree ductless Gree · Heat Pump
Weak cooling or heating - Gree ductless Gree · Heat Pump

Source: Gree Vireo GEN3 9-24k (3VIR..HP115-230V1A) service GREE_VIREOGEN3_SERVICE_090921.pdf - section 6. Function and Control, outdoor units. Written in our own words as a summary; always check the original manual.

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.