Gree · Heat pump

L7 No master indoor unit

Medium severity Gree GMV6 Mini VRF

What the control is telling you

No indoor unit is set as master.

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

Likely causes

Master not assigned
D1/D2 wiring to master

Test and repair steps

Assign a master indoor unit from the wired or wireless controller.
Check D1/D2 wiring to the master unit.

Models that show this code

3 models in Gree GMV6 Mini VRF

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

Other codes on the same units

L1 Indoor fan protection
L4 Wired controller power fault
L5 Indoor freeze protection
L6 Mode conflict (24 V adapter systems)
L8 Indoor power insufficient
P4 Compressor drive PFC protection
P5 Compressor phase overcurrent
P6 Compressor drive IPM protection

Save it for the next call

Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.

Open the app

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. Summarized in our own words; check the original manual for your model.

Homeowner looking at this code? See what it means for you and when to call a technician.

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.