Be aware that the fan motor is just a shaded pole “C” frame. And the fan proofing switch (if equipped) is no more than a sail on a micro-switch of the fan motor cooling. Any air restriction or motor loss of speed will effect the switch function. Plugs and micro switch problems were common on the old analog version.
The digital versions like you have have been simplified were the controller does it all. But, the controller has to see the right voltage and be programmed correctly. Start by actually measuring the line voltage coming into the machine. Then check the low voltage tap on the transformer to be correct for your input voltage. Now check the transformer output voltage. Once that is done you can confirm programming. Oh, make sure to check the thermistor with a ohm meter. wiggle the wire around and monitor it by using a ice cube and a heat gun to see if it is stable. How clean was the controller compartment? Plug connections have always been a problem with digital equipment.
BTW, preheat should take the oven to 150C. Holding/min temp is 60C but can be programmed higher. Like the 80 you see. You may want to check the encoder. I'm not certain of it's design. If anyone has a old one, I'd like to dissect it.