Gree Error Code n6: Fault history query (Heat Pump)

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

Gree error code n6 on a heat pump means: Fault history query. It is also called Gree diagnostic code n6.

Low severityHeat PumpGree GMV6 Mini VRF

Homeowner? What Gree code n6 means for you

Usually minor Your heat pump is reporting: Fault history query. 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 n6 mean?

n6 opens the history of the last five faults. LED1 cycles through the fault code and module address one at a time at 1 second intervals, and 00 means no more entries. Holding SW3 for over 5 seconds clears the stored history.

Applies to: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V..WL/C-T(U))

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 n6

GMV-V36WL/C-T(U)GMV-V48WL/C-T(U)GMV-V60WL/C-T(U)

Other Gree Heat Pump codes

Code	Meaning
LU	PG fan motor zero-crossing fault
n0	Auto energy saving (menu)
n1	Defrost cycle K1 setting
n3	Forced defrost (menu)
n4	Maximum output limit (forced energy saving)
n5	Indoor engineering number offset
n7	Running parameter query
n8	Indoor engineering number query
n9	Online indoor unit count
nA	System mode: cooling and heating
nb	Outdoor and controller barcode query
nC	System mode: cooling only

All Gree Heat Pump error codes →

Gree code n6: homeowner questions

What does Gree code n6 mean?

Fault history query. n6 opens the history of the last five faults. LED1 cycles through the fault code and module address one at a time at 1 second intervals, and 00 means no more entries. Holding SW3 for over 5 seconds clears the stored history.

Is it safe to keep using my heat pump with code n6?

Usually yes. Code n6 is normally minor, but if it keeps coming back have it checked.

Can I reset Gree code n6 myself?

You can try one reset (power off for 30 seconds, then on). If Gree code n6 comes back, the cause is still there and a licensed technician should check it.

Who can fix Gree code n6 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 GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.2.4.1 and Chapter 3 Faults, 4.1 Error Indication. 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.