I have a brand new dishwasher, only about a month old, working fine without any problems until I switched it on one day and it came up with a H294 code in the display. This error code is not in the troubleshooting section of the manual, and it can't seem to find it anywhere else. I can't get anything to work, despite pressing other buttons and switching it on and off. Yesterday it was working fine, no problems. Any ideas? It's brand new!!