Hi Ian
Error code E3 is "Longer heating time but did not reach required temperature" possible causes - malfunction of temperature sensor or heating element.
You could always try the famous power off power on and try again routine. If that doesn't sort it it's a professional job i'm afraid
Sparky
March 2009
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix dishwashers.