Stuart,
To solve this the drain pump will almost certainly have to be removed and stipped to find the obstruction. Owing to the design masterpiece which is the Indesit dishwasher, it has to come out of the housing and EVERY body panel has to removed in order to get the undertray off. 🙄 Then, one screw will allow the drain pump to be removed…….
Seriously, I’d get some help; it is an extremely awkward one to solve and even I don’t like doing them, and I’m a professional!
Check the Directories section for a local UKW engineer or pop your post code up here and someone will pick up on it.
Regards,
Penguin45.