Gree Versati II Series, Service Manual

12

Test Operation & Troubleshooting & Maintenance

5�2 Troubleshooting

Malfunctions 

Reasons

Troubleshooting

Compressor does 

not start up 

① 

Power supply has problem.

② 

Connection wire is loose.

③ 

Malfunction of mainboard.

④ 

Malfunction of compressor.

① 

Phase sequence is reverse.

② 

Check out and re-fix.

③ 

Find out the reasons and repair.

④ 

Replace compressor.

Heavy noise of fan 

① 

Fixing bolt of fan is loose.

② 

Fan blade touches shell or grill.

③ 

Operation of fan is unreliable.

① 

Re-fix fixing bolt of fan.

② 

Find out the reasons and adjust.

③ 

Replace fan.

Heavy noise of 

compressor

① 

Liquid slugging happens when liquid 

refrigerant enters into compressor. 

② 

Internal parts in compressor are broken. 

① 

Check if expansion valve is failure and 

temp. sensor is loose .If that, repair it.

② 

Replace compressor.

Water pump does 

not run or runs 

abnormally

① 

Malfunction of power supply or terminal.

② 

Malfunction of relay. 

③ 

There is air in water pipe.

① 

Find out the reasons and repair. 

② 

Replace relay.

③ 

Evacuate.

Compressor starts or 

stops frequently 

① 

Poor or excess refrigerant.

② 

Poor circulation of water system.

③ 

Low load.

① 

Discharge or add part of refrigerant.

② 

Water system is blocked or there is air in 

it.Check water pump, valve and pipeline. 

Clean water filter or evacuate.

③ 

Adjust the load or add accumulating 

devices. 

The unit does not 

heat although 

compressor is 

running

① 

Leakage of refrigerant.

② 

Malfunction of compressor.

① 

Repair by leakage detection and add 

refrigerant.

② 

Replace compressor.

Poor efficiency of hot 

water heating

① 

Poor heat insulation of water system.

② 

Poor heat exchange of evaporator.

③ 

Poor refrigerant of unit. 

④ 

Blockage of heat exchanger at water side.

① 

Enhance heat insulation efficiency of the 

system.

② 

Check if air in or out of unit is normal and 

clean evaporator of the unit.

③ 

Check if refrigerant of unit leaks.

④ 

Clean or replace heat exchanger. 

5�3 Repair

5�3�1 Key Components

Picture

Name

Function

Compressor

It is the heart of the cooling system, mainly used to 

turn the low-temperature, low-pressure refrigerant 

vapor to high-temperature high-pressure vapor and 

then discharge it to the evaporator. The two-stage 

enthalpy-adding compressor is adopted herein, which 

can improve the heating performance of the unit 

largely.

Electrostatic 

Expansion Valve

It is one of four main components and used to turn 

the hi-pressure liquid refrigerant to low-temperature, 

low-pressure vapor-liquid mixture and adjust the 

refrigerant flow rate entering the evaporator.