Cabdy CDI 1012 built in dishwasher, fills with water, motor kicks in, then pulses on and off with water also pulsing on and off. Have checked for blockages etc, replaced pressure switches but no joy. When dispenser was disconnected, filled and washed ok, so replaced part and left working. Next wash playing up again, although seemed to work on quick wash. This ones got me puzzled, any help greatly appreciated.