LG WM-1376FHB 7kg Intello washing machine- showing code E5 or S5 won't work?

The washing machine panel shows E5or S5 when switched on and will not work. I've tried other wash programmes and the filter isn't blocked. Do you know what the problem is. If it's repairable and whether the expense would be worthwhile. If so how much do you think the repair would be. I like to have an idea of the problem before I call out an engineer just in case they say its something completely different whatever. Thankyou.