Re: Hotpoint Aquarius FDW20 LED 2+4 Heater fault.
first thing to do is to test the heater, plug out, place a few towels on the floor and lean the machine over onto it’s left hand (from front) side. Remove the base plate and the ‘tube’ heater can be seen, top right. Check for resistance, continuity and insulation. A bit of a fiddle to change but not the hardest job to do, apart from getting the hose clips back on that is. 🙁 Thin jubilee clips are advisable if you can source them.
If the heater tests OK then the main pcb is the other main cause of this fault.