Why does the outdoor temperature show an extremely high value instead of a negative number?

The outdoor temperature register at address 118 uses int16 encoding, not uint16. Ensure the register data type is set to int16 in the template configuration. If it is read as uint16, negative temperatures will display as large positive numbers.

What baud rate and serial settings should I use?

The Gree Versati requires 9600 baud for Modbus RTU communication. Confirm data bits (8), stop bits (1), and parity settings match the heat pump configuration. Mismatched serial parameters will result in communication timeouts.

Can I read and write all registers in this template?

No. Registers at addresses 2 through 44 support both read and write operations for setpoints and controls. Registers from address 117 onward are read-only and provide sensor data and status information. Attempting to write to read-only registers will return an error.

Do I need to enable Modbus on the Gree Versati before connecting?

Yes. On some Versati models, the Modbus RTU interface must be explicitly enabled through the unit's service menu or DIP switch settings. Consult the Gree installation manual for your specific model variant.

Free Modbus template: Versati Heat Pump

Name: Versati Heat Pump
Brand: Gree
SKU: 85cbfd8f-c06e-431a-bc35-0e932228a6e8

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Free Modbus template: Versati Heat Pump | ModbusCloud

Registers (30)

30 read / 21 write

Name	Address	Function	Type	Unit	Access
Mode	2	FC03	uint16		R/W
Optional E-Heater	3	FC03	uint16		R/W
WOT-Cool	9	FC03	uint16	℃	R/W
WOT-Heat	10	FC03	uint16	℃	R/W
RT-Cool	11	FC03	uint16	℃	R/W
RT-Heat	12	FC03	uint16	℃	R/W
T-water tank	13	FC03	uint16	℃	R/W
T-Eheater	14	FC03	uint16	℃	R/W
T-Other switch on	15	FC03	uint16	℃	R/W
Upper AT-Heat	17	FC03	uint16	℃	R/W
Lower AT-Heat	18	FC03	uint16	℃	R/W
Upper RT-Heat	19	FC03	uint16	℃	R/W
Lower RT-Heat	20	FC03	uint16	℃	R/W
Upper WT-Heat	21	FC03	uint16	℃	R/W
Lower WT-Heat	22	FC03	uint16	℃	R/W
△T-Cool	29	FC03	uint16	℃	R/W
△T-Heat	30	FC03	uint16	℃	R/W
△T-hot water	31	FC03	uint16	℃	R/W
△T-Room temp	32	FC03	uint16	℃	R/W
On_Off	42	FC03	uint16		R/W
Error reset	44	FC03	uint16		R/W
Unit status	117	FC03	uint16		R
T-outdoor	118	FC03	int16	℃	R
T-water out PE	125	FC03	uint16	℃	R
T-optional water sen.	126	FC03	uint16	℃	R
T-water in PE	127	FC03	uint16	℃	R
T-tank ctrl.	128	FC03	uint16	℃	R
T-remote room	129	FC03	uint16	℃	R
Thermostat	132	FC03	uint16		R
T-weather depend	137	FC03	uint16	℃	R

Versati Heat Pump

Overview

Key readings

Available commands

Use cases

Installation

Things to watch for

Registers (30)

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