I need an user manual for a Simpson riviera dishwasher mod..52B866BW*04

SOURCE: dishwasher always trys to drain and won't wash

If it is a bosch, see my guide here on drainage issues. While there is a massive recall on the control boards, I doubt it is really your problem. Most likely a plug in the drainage system.

SOURCE: Simpson Dishwasher manual

Some manuals and/or schematic diagrams here. Can also upload manuals.

http://spares.bigwarehouse.com.au/

SOURCE: dishwasher simpson (silencio 850) model 52B850SF * 04

Check that the pressure switch tubes are not blocked on the underside of the machine on the right hand side and that the pressure switches are working when you blow down their tubes. You will hear them click on and off.