Haier HB21FWRSS Service Manual page 44

Sometimes, the compressor will run continuously (for several hours or run without end), If the
food placed in the refrigerator is not too much, there may be the following two situations: I)
the refrigerator very low, this means that the control system is probably out of order; ii) the
control system works normally, and there are troubles in the refrigerating system or other
parts.
1) Temperature is set improperly
a) The temperature control knob is set to the "coldest" position. This position is to be used for
fast freezing or continuous running, its temperature for power off is too low, therefore, the
compressor won't stop and the temperature in the refrigerator becomes lower and lowers.
b) Inspection method: check the temperature control knob to see whether it is set in the
position "coldest".
2) Thermostat is malfunctioning and makes the compressor running continuously
Analysis of Trouble
When the thermostat doesn't work normally, it will make the compressor run continuously,
and hence very low temperature will be achieved in the refrigerator. The fault is generally due
to the fact that the contacts of the thermostat cannot be released.
Remedy
Dismantle the thermostat and make a through checkup, if it is totally out of functioning,
replace it with a new one.
3) evaporation temperature is too high in refrigerating system, resulting in lower refrigerating
capacity and hence continuous running of compressor
Analysis of Trouble
Leakage of refrigerant and clogging in a refrigerating system will directly affect its
refrigerating capacity. Due to the reduction in its refrigerating capacity, the refrigerator
temperature cannot reach its rated value, the thermostat won't work, and thus the compressor
runs continuously. When the evaporation temperature in the system is too high, the
temperature-sensing agent in the temperature sensor is also hotter, therefore, the thermostat
is unable to cut off the power supply to the compressor and stop it.
Remedy
If it has been found that the refrigerant in the system is insufficient in quantity, recharge it
with refrigerant. In case clogging occurs, disassemble the part where it is blocked. If the
evaporation temperature is too high, settle this problem with an appropriate quantity of
refrigerant.
4) No stoppage of compressor due to damaged heat-insulation layer inside case body and/or
door seal
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