dont know the answer but did have errors displayed on my old microwave. just switched it off at the plug and leave for some time - also make sure your plate inside microwave is secure and sitting on the right points
Crypto Peerless are a commercial brand and the error codes can be very vague. The problem could be the door switches, magnatron or pcb to name but a few! Crypto Peerless are made by Sharp but are not highly regarded in the commercial world. It might be cheaper to buy a new one what with repair costs being what they are!