I don't think the connect valve is the problem because it never gets blocked, if it can be connected to the male side of the valve water will flow through it.
Have you checked to see if water is actually flowing from the water pump? If water is coming from the pump the problem is most probably the spray tips in the cleaning tool blocked.
Without connecting any water hoses to the machine turn on the water pump and press the button inside the valve coming from the machine ...if no water comes out from the valve the water pump has a problem.
I can come to service the machine if you wish and determine the problem.
Cost would be 3,100 Baht call out charge which includes labour to fit any new parts that might be needed but does not include cost of any parts.