Candy Dishwasher fault codes.

Hi,
Now this may sound a bit vague but a customer has just phoned to say his candy dishwasher stops half way through and flashes lights at him.
He says it flashes the 3rd of the 5 lights and the economy light. I dont have a model number as he was calling from work.
I’ve had a look in the whitegoods bible but there are no error codes that involve lights, just E1 E2 etc for a digital display version.
If anybody could shed any light on this for me it would really be appreciated before I go and have a look at it for him.

Cheers

Nick