had a look at known errors but cant see this one .customer says machine starts ok but after a while it stops with just the prewash light flashing.i have tested the heater & thermistor which appear ok.i didnt hang around to see the fault occur as i was’nt sure what to go for next.hopefully nothing too serious as the drum bearings also need replacing.
Prewash led flashing means, timed out on fill. Can be an open circuit solenoid valve, a clogged filter on solenoid valve, water supply off etc. More than not i find that the fault is caused by syphoning, the water is draining after pump has stopped. Look for dirt or grime build up in waste drain pipe, this tends to seal air gap required. I normally cut end off waste hose from machine.