Gree Error Code bH: System clock abnormal (Heat Pump)

Updated October 13, 2026 · by Aurora Star Tech Inc.

Gree error code bH on a heat pump means: System clock abnormal. It is also called Gree diagnostic code bH.

Low severityHeat PumpGree GMV6 Mini VRF

Homeowner? What Gree code bH means for you

Usually minor Your heat pump is reporting: System clock abnormal. 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 bH mean?

The board clock is wrong.

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

Common causes of Gree code bH

Clock not set
Board fault

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 bH

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

Other Gree Heat Pump codes

Code	Meaning
b2	Defrost (coil) sensor open or shorted (20K)
b4	Sub-cooler liquid outlet sensor open or shorted (20K)
b5	Liquid line (valve) temperature sensor open or shorted
b6	Accumulator inlet sensor open or shorted (20K)
b7	Gas line (valve) temperature sensor open or shorted
bd	Sub-cooler gas inlet sensor open or shorted (20K)
bJ	High and low pressure sensors swapped
C0	Communication fault IDU/ODU/wired controller
C1	Main board to DC-DC controller communication fault
C2	Main board to compressor drive communication fault
C3	Main board to fan drive communication fault
C4	Missing indoor units

All Gree Heat Pump error codes →

Gree code bH: homeowner questions

What does Gree code bH mean?

System clock abnormal. The board clock is wrong.

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

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

Can I reset Gree code bH myself?

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

Who can fix Gree code bH 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

Compressor will not run - Gree ductless Gree · Heat Pump
Louver will not swing - Gree ductless Gree · Heat Pump
Noise or vibration - Gree ductless Gree · Heat Pump
Outdoor fan will not run - Gree ductless Gree · Heat Pump
Unit will not start - Gree ductless 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 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.