Kitchen refurb project – Cata dishwasher u/s, whose responsible?

Hi,

I’ve a question that is more a general point on service support for appliances that are installed by an installer (be it an independant or specialist) as part of a kitchen refurb project. My other half had a kitchen refurbed, the whole thing, floor, walls, ceiling/lighting, units and all the main apliances. 18 months later the dishwasher is unserviceable and the service guy says the parts can’t be obtained for the model (a Cata I think). I know that if I bought a dishwasher direct from a retailer I would expect the retailer to either repair or replace a dishwasher if it died after 18 months. Should she expect the kitchen installer to do this on her behalf? She paid the installer direct, not the appliance supplier.
Normally I’d be expected to get my hands dirty with this kind of thing, but as it’s so new and I’m very busy, I’ve told other half to get in touch with the installer. I wasn’t involved in this project at all, and when I asked OH if she had thought about the quality of the appliances when she got quotes I got a snotty look for my trouble.