45
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P3 –Liquid Deficiency Protection
Explanation of
error
Cause: The liquid volume of the system is less than 30%, which leads
to non-refrigeration and liquid shortage protection.
Inspection path: whether the valves of the outdoor unit are opened
→
whether the evaporator, condenser, connectoin pipe are damanged or
cracked
→
whether the environmental temperature sensor and the coil
temperature sensor are damaged at the same time
Tools required
for inspection
Hex nut, multimeter, pressure gauge
Frequent
problematic part
Stop valve, evaporator, condenser and connection pipe
Inspection
procedure and
key points
1.
Check the stop valve and turn it counterclockwise with hexagons to
see if the valve is not open and the opening is not enough;
2.
Check whether the evaporator, condenser and connection pipe are
damaged or cracked, and focus on checking whether there is refrigerant
leakage in the welding part and connection pipe joint;
3.
Measure the temperature sensor with the multimeter at ambient
temperature, and whether the coil temperature sensor has abnormal
resistance at the same time.