Troubleshooting; Repair; Key Components - Gree GRS-CQ8.0Pd/NaEK Service Manual

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


Compressor does

not start up


Heavy noise of

fan


Heavy noise of
compressor


Water pump does

not run or runs

abnormally

Compressor

starts or stops

frequently
The unit does not

heat although

compressor is
running


Poor efficiency of

hot water heating


5.3 Repair

5.3.1 Key Components

Picture
Test Operation & Troubleshooting & Maintenance
Reasons
Power supply has problem.
Connection wire is loose.
Malfunction of mainboard.
Malfunction of compressor.
Fixing bolt of fan is loose.
Fan blade touches shell or grill.
Operation of fan is unreliable.
Liquid slugging happens when liquid
refrigerant enters into compressor.
Internal parts in compressor are broken.
Malfunction of power supply or terminal.
Malfunction of relay.
There is air in water pipe.
Poor or excess refrigerant.
Poor circulation of water system.
Low load.
Leakage of refrigerant.
Malfunction of compressor.
Poor heat insulation of water system.
Poor heat exchange of evaporator.
Poor refrigerant of unit.
Blockage of heat exchanger at water
side.
Name

Phase sequence is reverse.

Check out and re-fix.

Find out the reasons and repair.

Replace compressor.

Re-fix fixing bolt of fan.

Find out the reasons and adjust.

Replace fan.

Check if expansion valve is failure and
temp. sensor is loose. If that, repair it.

Replace compressor.

Find out the reasons and repair.

Replace relay.

Evacuate.

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.

Repair by leakage detection and add
refrigerant.

Replace compressor.

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.
Function
122
Troubleshooting