Hoover Optima washing machine ?

We have a similar problem with our Hoover washing machine. It too is only 18 months old & Hoover want around £110 call out which seems ridiculous when the machine is so new. It shows code E03 and keeps stopping, plus code E16 at times. We have now replaced the pump & checked all the outlets aren't blocked but it's still erratic, occasionally completing a full cycle but mainly stopping mid wash. Can anyone help please?