Why does Air conditioning suddenly not cooling after running some days?

When this failure occurs, first turn on observation within the fan and check if the fan is working correctly outside; if the fan in indoor unit and outdoor unit is working properly, check the blower outlet with the condenser temperature is normal or not; handle export no cold air blowing out and the outdoor unit fan condenser without heat, the next check.
Power, open air conditioner outdoor machine machine shell, boot observation compressor running whether normal; if compressor not work, is power, with multimeter detection indoor machine temperature sensor resistance whether normal; if temperature sensor resistance normal, is detection indoor machine computer Board Shang of the plug received pieces whether exists loose or contact bad phenomenon; if no, is detection compressor all introduction feet winding resistance (as started winding end, and run winding end and public winding ends resistance) whether normal; if resistance disorders, Check compressor circuit if there is a problem; if the measured resistance value doesn’t match the standard value, describes compressor circuit faulty if measured resistance to normal, but check the compressor terminals between shell and no short circuit (resistance is infinite), describes compressor circuit properly, then the next check.
By air conditioner emergency key, will air conditioner forced boot, with pressure table detection pipeline system pressure whether normal; if pipeline system pressure normal, description not missing refrigeration agent, at this time again with pliers shaped ammeter detection air conditioner outdoor machine of running current whether normal; if running current partial big, is power with multimeter detection compressor of running capacitor whether internal open, if multimeter pointer has ups and downs dropped action, description capacitor no open, at this time is into – step judgment is compressor fault also is compressor started circuit of fault, Rebooting after the replacement of a model with the new capacitor and detect whether the operating current to normal if the normal running current indicates that the failure was caused by declining capacitance. Replacing attention compressor capacitor wiring capacitor pin ends of the wiring order, do not place the wiring connected to the wrong, preventing the expansion down.

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