Hisense RD-31WC4S series Service Manual page 22

4)Low working
efficiency of
compressor
5) There is something
that blocked the liquid
cycle system
2.NO COOL
(Popular failure reasons are below):
Reason
1) Leakage of gas
2)There is some thing
that blocked the liquid
cycle system
b, higher temperature of discharging tube.
C, much noise
General when a compressor works for many
years, some parts of compressor were wear, so
that compressor discharge less gas out, unit
does not work strongly.
Phenomenon of failure:
a, lower pressure of discharging, check the
pressure of system with pressure meter to see
if it is normal.
b, higher temperature of compressor surface.
C, cut off the discharging tube, to see if you can
block the gas coming out of the tube when
compressor is working.
Some time there is something blocked the
filter of liquid cycle system, so that unit is not
cold.
Phenomenon of failure:
a, lower pressure of discharging
b, lower temperature of discharging.
analysis
Phenomenon of failure:
a, leaking fast
b, leaking slowly
c, no voice of liquid flowing
d, cut off charging tube, no gas goes
out.
A,Ice blocking
Sometime because unknown reason
water comes into liquid cycle
system, the capillary will be blocked
by water after unit runs for period of
time.
Phenomenon of failure:
The unit works well in the inception,
after period of time the ice appears
in the capillary and becomes more
and more, till blocks the hole of
capillary completely. In the moment
you can find the ice on the
evaporator defrosts. The noise of
liquid flow disappears. The pressure
of absorbing becomes negative.
Change a new compressor.
Change a new filter
Solutions:
First find out the point of leaking on tube, and
then sealed it, vacuuming it, finally recharge
with gas.
Note：
If you find oil on somewhere, it is possible that
leakage point is there.
First stop unit for several minutes, and then
open charging tube, discharge all of gas. Blow
the cycle system with gas of nitrogen, and then
recharge Gas, finally sealed the system.