Remove the soap tray.. in the soap try is a removable section in the conditioner compartment called a syphon, remove that and you'll probably find gunge blocking it.. give it a scrub together with the tube that it fits onto.. then place it back into the tray and test..
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Ok.. Can you check that the appliance is level and not tilted forwards at all..
Also, remove the soap dispenser again, then using a milk bottle or similar container, pour some water into the hose at the base of the container...
Let me know what happens