Thanks, I understand that the motherboard is an issue with models of this type. However, the heater only had two wires. Each one was plugged in on the opposite end of a heating coil. Therer are two heating coils on the defroster. It appeared that only one coil could be plugged in at a time. The one that had been plugged in was burnt out(broken coil). So I plugged in the other coil that appeared unused and intact.
Is there anyway to reset the blink and scrolling zeros?