GREE U-Match 5 SERIES UNIT SERVICE MANUAL
97
obvious scraping. If there is a normal compressor working nearby, compare their operating noise.
Step 3:
Examine whether the electronic expansion valve of the outdoor unit is active and whether the 4-way valve
works or not. How to examine:
(1) Electronic expansion valve:
The electronic expansion valve will be reset every time when the unit is powered on or off. Touch the valve
and you can feel the movement of the valve spool. In the last stage of the reset process, you will hear the click of
the valve and feel its vibration.
Touch the electronic expansion valve:
a. Touch the top of the electronic expansion valve and you can feel its move as it is reset upon startup.
b. Make sure the coil is fixed firmly.
(2) 4-way valve:
During normal operation, the 4 copper tubes that connect to the valve will have different temperature. When
the 4-way valve is working, it will generate some noise and vibration.
This is the position of the 4-way valve.
Do not touch it directly with your hands.
There is hot refrigerant at the exhaust
pipe, so be careful not to be scalded.
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