Fault detection and diagnosis for refrigerator from compressor sensor

A sealed refrigerant system, the refrigerant system comprising:

• an evaporator receiving refrigerant in liquid phase for evaporating the refrigerant into a vapor phase;
• an evaporator fan for moving air external to said evaporator;
• a compressor for receiving the refrigerant in vapor phase and for compressing the refrigerant;
• a condenser for receiving the refrigerant in vapor phase and for condensing the refrigerant into a liquid phase that is supplied to said evaporator;
• a condenser fan for moving air external to said condenser;
• and
• a controller coupled to said compressor;
• said controller transmitting control signals to said compressor and receiving a feedback signal from said compressor from which a compressor frequency of said compressor is determined, said controller identifying a fault in said evaporator fan as a function of the compressor frequency.

A sealed refrigerant system, the refrigerant system comprising:

• an evaporator receiving refrigerant in liquid phase for evaporating the refrigerant into a vapor phase;
• an evaporator fan for moving air external to said evaporator;
• a compressor for receiving the refrigerant in vapor phase and for compressing the refrigerant, the compressor having a piston that is displaced;
• a condenser for receiving the refrigerant in vapor phase and for condensing the refrigerant into a liquid phase that is supplied to said evaporator;
• a condenser fan for moving air external to said condenser;
• and
• a controller coupled to said compressor for transmitting control signals to said compressor and for receiving a feedback signal from said compressor from which a compressor frequency of said compressor is determined based upon displacement of the piston within said compressor, said controller identifying a fault in said compressor as a function of the compressor frequency.