Wash/drying lights flashing?

When i start a wash, it starts as normal but when the wash cycle is about to start the wash and drying lights start to flash and then the machine stops working, I,ve tried the reset button and no joy so i,ve turned it off and then back on and the lights are off, i,ve washed the filter, then i retry a wash and the lights start to flash again. I,m unable to use a dishwasher cleaner as the wash cycle does'nt even start. Why is this happening? And what can i do to sort it out?