haier HRF- 329AA - Manual (Page 24)

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caused by dirt , tapping the suspicious clogged point (generally in the
capillary or the connection joint of the filter) may cause the refrigerant to
flow through partially, resulting in some corresponding change, whereas in
that case if you heat it with a hot towel, no reaction will happen, no flowing
sound can be heard, moreover, there is no periodic change. After rejecting
the possibility of ice clogging, it can be generally considered as the
clogging due to dirt .
Remedy
Dismantle the system, remove the dry filter from it, purge the tubing with
nitrogen, install a new filter, then evacuate it and finally charge it with
refrigerant.
C) Clogging in filter
Analysis of Trouble
Total clogging of a filter is rarely to occur. This trouble is mostly caused
by the paste-like matter formed from the substances filled into the system
or other dust after the refrigerator has been used for a longer time, or by
the dirt accumulated gradually inside the filter. Sometimes, tapping the filter
nay cause a passage for flowing, Touching it with your hand, you will feel
that it is cooler compared with its temperature in the normal state.
Remedy
The same as described in the capillary clogging with dirt.
3) Troubles of Compressor
a) Breakage of gas suction and discharge valve blocks
Analysis of Trouble
The compressor works by means of the opening and closing of gas
suction valve and discharge valve to suck and discharge the refrigerant. If
the valve block is broken, the refrigerant can not be discharged, and hence
no refrigerating can be achieved.
Method for making judgement
It is quite difficult to differentiate this trouble from others because they
often have similar symptoms. In repairing, firstly, hear attentively if there is
some abnormal sound coming from the compressor (sometimes , the
broken pieces of valve block may strike against the cylinder), and feel the
compressor casing with your hand to ascertain whether it is too hot, this is
also helpful to the troubleshooting; secondly, measure the pressures at the
high and low pressure ports of the compressor with pressure gauges, if the
gas suction valve block is broken, the suction pressure gauge pointer will
swing violently and the suction pressure is very high, whereas when the
gas discharge valve block is broken , the discharge pressure gauge pointer
will swing drastically and the discharge pressure is very high. In the both
cases, stop the compressor at once, and if technique is available, open the
cylinder cover and check up the valve block, repair it, or replace it with a
new one,
C. Sudden stop of Compressor during Its Running
Maintenance Service and Trouble Shooting