This is the common white knight dryer.
I have replaced heater and made a mistake refitting tags to the
Heater and terminal block on top left corner.
Help appreciate
the red and black wires are the half heat switch so does not matter which way round it goes as long as they are on 2 and 3 ( in this case it causes a short circuit)
the other 2 wires are from the stats so swop them and it will still work but the polarity on the element changes