Midea's air conditioning verification code shows dR, but the matching is unsuccessful. What is the reason?

Hello, please check whether the compressor overload protector plug-in system on the electronic control motherboard is short-circuited. If the air conditioner is still faulty, it can be judged that the motherboard of the hundred air conditioners is faulty and needs to be replaced. 2. Test the overload protector of the compressor with a multimeter at room temperature. If the overload protector is open, it can be judged that the overload protector is damaged and needs to be replaced. 3. Check whether the compressor performance resistance is normal and whether the performance system is dirty or blocked.