First with a multimeter to check the compressor motor winding resistance, winding resistance investigation two normal (note: should be marked normal). Then use a multimeter to check the relay K 14V DC voltage across the coil no. After the trial leads to very short transistors Q811 ce power test machine, compressor starts normally, thus determine damage to the transistor Q811 (open). After using the same model specifications transistor replacement, refrigerator back to normal.mRqservice manual download site