Thanks very much for the reply. I bought a new heater/circulation pump assembly about 6 months ago as it was stopping after 15 minutes when the heater should kick in, but on removing the old one I found it was good (checked resistance with a multimeter) but the impeller was a bit stuck. Freeing that up seemed to cure it so I now have a spare. This error seems different as it’s not stopping after 15 minutes but never draws water in or heats up (I’ve checked the water supply is good). Having forked out £85 for a heater/pump and £25 for a hose I’m reluctant to spend over £100 on a circuit board. It may be time for a new dishwasher, much as I hate to throw away repairable equipment, as it may be beyond economic repair….