Gree VERSATI III Series, Service Manual

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Test Operation & Troubleshooting & Maintenance
hydraulics system pressure according to next item:
①
If the pressure is less than 0.5 bar, please recharge the water immediately;
②
When recharging, the hydraulics system pressure should be not more than 2.5 Bar.
5.2 Troubleshooting
Malfunctions Reasons Troubleshooting
Compressor does
not start up

Power supply has problem.

Connection wire is loose.

Malfunction of mainboard.

Malfunction of compressor.

Phase sequence is reverse.

Check out and re-fix.

Find out the reasons and repair.

Replace compressor.
Heavy noise of fan

Fixing bolt of fan is loose.

Fan blade touches shell or grill.

Operation of fan is unreliable.

Re-fix fixing bolt of fan.

Find out the reasons and adjust.

Replace fan.
Heavy noise of
compressor

Liquid slugging happens when liquid
refrigerant enters into compressor.

Internal parts in compressor are broken.

Check if expansion valve is failure and
temp. sensor is loose. If that, repair it.

Replace compressor.
Water pump does
not run or runs
abnormally

Malfunction of power supply or terminal.

Malfunction of relay.

There is air in water pipe.

Find out the reasons and repair.

Replace relay.

Evacuate.
Compressor starts or
stops frequently

Poor or excess refrigerant.

Poor circulation of water system.

Low load.

Discharge or add part of refrigerant.

Water system is blocked or there is air in
it. Check water pump, valve and pipeline.
Clean water filter or evacuate.

Adjust the load or add accumulating
devices.
The unit does not
heat although
compressor is
running

Leakage of refrigerant.

Malfunction of compressor.

Repair by leakage detection and add
refrigerant.

Replace compressor.
Poor efficiency of hot
water heating

Poor heat insulation of water system.

Poor heat exchange of evaporator.

Poor refrigerant of unit.

Blockage of heat exchanger at water
side.

Enhance heat insulation efficiency of the
system.

Check if air in or out of unit is normal and
clean evaporator of the unit.

Check if refrigerant of unit leaks.

Clean or replace heat exchanger.