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Gree · technician tips

Gree service menus, test modes and resets

15 tips for heat pump: access codes, button combinations, test modes and the resets you need at the appliance.

Jump to: Button combinations (3) · Service & test modes (5) · Reset & cancel (1) · Settings shortcuts (5) · Commissioning (1)

Button combinations

Key presses that open menus, show readouts or switch modes.

Read live running parameters of an outdoor module (function n7)

Heat pump · Gree GMV6 Mini VRF

Shows parameter codes such as outdoor ambient, compressor frequency and pressures for a chosen module.

  1. Hold SW2 on the master for over 5 seconds, select n7 and confirm with SW3.
  2. Pick the module with SW1 and SW2 and confirm with SW3.
  3. Pick the parameter code with SW1 and SW2.
  4. Four-digit temperatures show as two pairs, for example 01 then 15 for 115 degrees; a negative reading is introduced by nE.

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.2.4.2 and Chapter 3 Faults, 4.1 Error Indication. Written in our own words; check the manual for your exact model.

Read or clear the fault history (function n6)

Heat pump · Gree GMV6 Mini VRF

Shows the last five faults with module address; 00 means no more entries.

  1. Hold SW2 on the master for over 5 seconds to open the query menu.
  2. Select n6 with SW1 and SW2, confirm with SW3.
  3. Step through entries with SW1 and SW2; 00 ends the list.
  4. Hold SW3 for over 5 seconds to clear the history.

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

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; check the manual for your exact model.

View the stored malfunction code on the remote (LIGHT x6)

Heat pump · Gree Multi21+

Pressing the LIGHT key 6 times within 3 seconds shows the malfunction code on the indoor display.

  1. Press the LIGHT key on the remote 6 times within 3 seconds to start viewing.
  2. Repeat the 6 presses within 3 seconds to stop, or wait 5 minutes for it to end by itself.

Applies to: Multi21+ 18-24k multi-zone (MULTI..HP230V1CO)

Source: Gree Multi21+ multi-zone 18-24k (MULTI18-24HP230V1CO) service.pdf - section 9.1 Flashing LED of indoor/outdoor unit and primary judgement. Written in our own words; check the manual for your exact model.

Service & test modes

Forced fan, low and high fire, test and diagnostic modes, error history and live data.

Force a defrost cycle from the remote

Heat pump · Gree Vireo GEN3

A key sequence on the remote forces the unit into defrost; the unit finishes and returns to normal heating by itself. If a fault or protection stop is active, the sequence only works once that is cleared.

  1. Turn the unit on in heating mode and set 16°C.
  2. Within 5 seconds press + - + - + - on the remote.
  3. The unit finishes the defrost and returns to normal heating by itself.

Applies to: Vireo GEN3 9-24k (3VIR..HP115/230V1A)

Source: Gree Vireo GEN3 9-24k (3VIR..HP115-230V1A) service GREE_VIREOGEN3_SERVICE_090921.pdf - section 6.2 (9) compulsory defrosting function; outdoor 6. Compulsory defrosting. Written in our own words; check the manual for your exact model.

Force a defrost from the outdoor board (function n3)

Heat pump · Gree GMV6 Mini VRF

Forces a defrost during maintenance; the system leaves it on its own when the normal exit conditions are met.

  1. Open the function menu: power the system, then hold SW1 on the master outdoor board for over 5 seconds.
  2. Pick the function with SW1 (up) and SW2 (down), confirm with SW3.
  3. SW4 steps back or exits; with no key pressed for 5 minutes the board leaves the menu by itself.
  4. Select n3 (00 flashes) and press SW3; n3 goes steady.

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.2.3.7 and Chapter 3 Faults, 4.1 Error Indication. Written in our own words; check the manual for your exact model.

Show indoor engineering numbers on the indoor units (function n8)

Heat pump · Gree GMV6 Mini VRF

Every indoor unit shows its engineering number so units can be matched to addresses; operation is not affected.

  1. Hold SW2 on the master for over 5 seconds, select n8, confirm with SW3.
  2. Hold SW4 on the master for over 5 seconds to return indoor units to normal.

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.2.4.3 and Chapter 3 Faults, 4.1 Error Indication. Written in our own words; check the manual for your exact model.

Start pump-down (refrigerant recycle) mode, function A2

Heat pump · Gree GMV6 Mini VRF

Pull refrigerant from a faulty module or the indoor pipework into the outdoor unit; the liquid service valve must be closed.

  1. Open the function menu: power the system, then hold SW1 on the master outdoor board for over 5 seconds.
  2. Pick the function with SW1 (up) and SW2 (down), confirm with SW3.
  3. SW4 steps back or exits; with no key pressed for 5 minutes the board leaves the menu by itself.
  4. Select A2; the default 01 flashes. Choose the recycle mode with SW1 and SW2, confirm with SW3 (01 recycles the indoor unit pipework).
  5. When the display asks for manual recycle, press SW3 on the master; the whole system stops at once and cannot restart for 10 minutes.

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.2.3.1 and Chapter 3 Faults, 4.1 Error Indication. Written in our own words; check the manual for your exact model.

Start vacuum mode for evacuating pipework (function A8)

Heat pump · Gree GMV6 Mini VRF

Opens every indoor and outdoor expansion and solenoid valve so the whole system can be evacuated; the system cannot be started while A8 is steady. It ends by itself after 24 hours.

  1. Open the function menu: power the system, then hold SW1 on the master outdoor board for over 5 seconds.
  2. Pick the function with SW1 (up) and SW2 (down), confirm with SW3.
  3. SW4 steps back or exits; with no key pressed for 5 minutes the board leaves the menu by itself.
  4. Select A8 (00 flashes), then press SW3; A8 goes steady.
  5. To leave, hold SW4 on the master for over 5 seconds. The mode also ends by itself after 24 hours.

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.2.3.5 and Chapter 3 Faults, 4.1 Error Indication. Written in our own words; check the manual for your exact model.

Reset & cancel

Clearing lockouts, service reminders and fault history; skipping purge or de-air programs.

Restore system defaults from the outdoor board (0C)

Heat pump · Gree GMV6 Mini VRF

Three variants clear different amounts; 0C blinks 3, 5 or 7 seconds on the master board to show which one is running.

  1. Full clear: hold SW1 and SW4 for over 10 seconds (0C blinks 3 s).
  2. Clear that keeps quantities and commissioning status: hold SW2 and SW4 for over 10 seconds (0C blinks 5 s).
  3. Third variant (manual prints SW3 and SW4): hold for over 10 seconds (0C blinks 7 s).

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.3 Restoration to Default Settings. Written in our own words; check the manual for your exact model.

Settings shortcuts

Where the useful parameters live and what they are set to from the factory.

Cap the maximum output (function n4)

Heat pump · Gree GMV6 Mini VRF

10 is 100 percent (default), 09 is 90 percent, 08 is 80 percent.

  1. Open the function menu: power the system, then hold SW1 on the master outdoor board for over 5 seconds.
  2. Pick the function with SW1 (up) and SW2 (down), confirm with SW3.
  3. SW4 steps back or exits; with no key pressed for 5 minutes the board leaves the menu by itself.
  4. Select n4, pick 10, 09 or 08 with SW1 and SW2, confirm with SW3.

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.2.3.8 and Chapter 3 Faults, 4.1 Error Indication. Written in our own words; check the manual for your exact model.

Limit the whole system to heating, cooling or fan only (function A6)

Heat pump · Gree GMV6 Mini VRF

Outdoor-board menu entry: nA cooling and heating (default), nC cooling only, nH heating only, nF fan only.

  1. Open the function menu: power the system, then hold SW1 on the master outdoor board for over 5 seconds.
  2. Pick the function with SW1 (up) and SW2 (down), confirm with SW3.
  3. SW4 steps back or exits; with no key pressed for 5 minutes the board leaves the menu by itself.
  4. Select A6, then pick nA, nC, nH or nF with SW1 and SW2 and confirm with SW3 (the value goes steady).

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.2.3.3 and Chapter 3 Faults, 4.1 Error Indication. Written in our own words; check the manual for your exact model.

Offset indoor engineering numbers (function n5)

Heat pump · Gree GMV6 Mini VRF

Shifts indoor engineering numbers so two systems on one central controller do not clash; use only on the master system (SA2 address 0000x).

  1. Open the function menu: power the system, then hold SW1 on the master outdoor board for over 5 seconds.
  2. Pick the function with SW1 (up) and SW2 (down), confirm with SW3.
  3. SW4 steps back or exits; with no key pressed for 5 minutes the board leaves the menu by itself.
  4. Select n5 (00 flashes) and press SW3 on the master system.

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.2.3.9 and Chapter 3 Faults, 4.1 Error Indication. Written in our own words; check the manual for your exact model.

Set automatic energy saving (function n0)

Heat pump · Gree GMV6 Mini VRF

01 is capability priority (default), 02 is energy-saving priority, which lowers capacity.

  1. Open the function menu: power the system, then hold SW1 on the master outdoor board for over 5 seconds.
  2. Pick the function with SW1 (up) and SW2 (down), confirm with SW3.
  3. SW4 steps back or exits; with no key pressed for 5 minutes the board leaves the menu by itself.
  4. Select n0, pick 01 or 02 with SW1 and SW2, confirm with SW3.

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.2.3.6 and Chapter 3 Faults, 4.1 Error Indication. Written in our own words; check the manual for your exact model.

Set outdoor silence mode (function A7)

Heat pump · Gree GMV6 Mini VRF

Codes 01-09 are smart night-silence modes (need an outdoor timer), 10-13 are forced silence, 00 is off (default). Silence modes lower capacity.

  1. Open the function menu: power the system, then hold SW1 on the master outdoor board for over 5 seconds.
  2. Pick the function with SW1 (up) and SW2 (down), confirm with SW3.
  3. SW4 steps back or exits; with no key pressed for 5 minutes the board leaves the menu by itself.
  4. Select A7 (00 flashes), choose 00 to 13 with SW1 and SW2 and confirm with SW3; the number goes steady.

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 4.2.3.4 and Chapter 3 Faults, 4.1 Error Indication. Written in our own words; check the manual for your exact model.

Commissioning

Start-up and set-up steps that are easy to miss.

Run the outdoor commissioning sequence (steps 01 to 17)

Heat pump · Gree GMV6 Mini VRF

On a new system or after replacing the outdoor main board, the outdoor display walks through numbered commissioning steps; a step with a fault shows the fault code and resumes once it is cleared.

  1. Start: when the board shows A0, hold SW3 for 5 seconds.
  2. 01 set master unit, 02 allocate addresses, 03 confirm outdoor quantity, 04 confirm indoor quantity (SW3 to confirm).
  3. 05 outdoor drive communication and capacity ratio, 06 outdoor components, 07 indoor components.
  4. 08 compressor preheat (SW3 may be used to confirm 8 hours have passed), 09 refrigerant check, 10 outdoor valve check (U6 shows if the valves are not fully open).
  5. 12 confirm start (AP, then AE), 15 cooling debug (AC) or 16 heating debug (AH), each passing after 50 minutes with no fault.
  6. 17 finished: oF and standby.

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

Source: Gree GMV6 Ultra Heat Mini VRF 36-60k (GMV-V36-48-60WL-C-T(U)) service.pdf - section 3.2.2.2 Test Operation and Debugging. Written in our own words; check the manual for your exact model.

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For licensed technicians. Installer menus, test modes and access codes change settings that affect safety; only use them if you are trained on the appliance and understand the result. Gas, electrical and refrigerant work must be done by a qualified, licensed person, and the manufacturer’s manual for the exact model and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.