Gree · Heat pump

J9 Low pressure ratio protection

Medium severity Gree GMV6 Mini VRF

What the control is telling you

Pressure ratio too low; mostly in cooling when the high/low split is too small.

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

Likely causes

4-way valve leaking
Compressor weak
Sensor fault

Test and repair steps

Check pressures with gauges and compare with the transducers.
Check the 4-way valve and compressor.

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

H8 Fan drive module overheated
H9 Inverter fan lost synchronism
J1 Compressor overcurrent
J7 4-way valve gas mixing
J8 High pressure ratio protection
L0 Indoor unit fault
L1 Indoor fan protection
L4 Wired controller power fault

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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.