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check pump/filter/outlet hose for blockages. if ok, check pressure switch (disc shaped item at top of machine with 4? wires and a tube) by blowing into it gently - should hear clicks, then blow into tube to pressure chamber - should be clear.
hi on the model before this one the wma series the flashy pre wash light is a faulty water inlet valve these mashines are allmost identical inside so check that,first check that you have the hot/cold pipes on the right way around hope this helps
Mine has been doing the same ... each time it goes to the next part of the cycle the red light flashes but the machine doesn't do anything ... so up till I have been able to get the machine moving to the next stage by pressing the "Start" button ... unfortunately the machine will pause on each stage - meaning I have to press "Start" at each stage!
If the pre wash led is flashing it indicates a h20 error (time out filling) some common causes are fill hose twisted trapped or kinked tap not turnd on the waste hose is connected incorectly and is causing the applionce to syphone if your waste pipe gose into a down pipe ensure it is in no more than 4 inches maximum and if it is connected to the u bend undr the sink you need to make sure the pipe gose above 60cm high at some point.