Air conditioner--Refrigerant
z The pressure of high and low
pressure end is high.
z Pipeline of low pressure end
frosts or dews heavily.
Expansion valve has
malfunction.
Check the expansion valve.z Refrigerant in low pressure
pipeline is too much.
z Open degree of expansion
valve is too big.
Phenomenon Possible reason Diagnose Method
State: cooling degree is not enough
z The pressure of low pressure
end is too high.
z The pressure of high pres-
sure end is too low.
There is inner leakage in
compressor.
Repair or change the
compressor.
z Compressor is bad.
z Expansion valve leaks or
sliding part is damaged.
Phenomenon Possible reason Diagnose Method
State: not cool
(8) Expansion valve is bad
(9) Not cool
î 219 î
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