Gree · Heat pump

J7 4-way valve gas mixing

High severity Gree GMV6 Mini VRF

What the control is telling you

High and low pressures are within about 14 psi of each other, so the 4-way valve seems to be leaking across.

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

Likely causes

4-way valve stuck mid-way or leaking
Pressure transducer fault

Test and repair steps

Check the 4-way valve coil and operation.
Check both pressure transducers against gauges.
Replace the valve or transducer as found.

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
J8 High pressure ratio protection
J9 Low 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.