I haven’t used this washing machine before yet as I have just moved in to a new house and it came with it, but before using it I noticed that the “prewash” LED is constantly flashing and don’t know how to make it stop. I tried to start a washload as per the instruction manual, but after trying to turn the washing machine on by turning the “programme on-off” knob nothing happens. The LEDs are supposed to light up but all that happens is the “prewash” button just keeps flashing and I can’t proceed any further. How can I get it to work? Thanks