Unplug the appliance from the wall socket and turn it around.
At the bottom right of the rear (viewed from the rear) you'll see a bulged compartment with two hoses going into it.
Prise this bulged compartment open (it hinges out) and take the hoses off.
Blow up the hoses to ensure they are clean and clear.
Next, take the pump out and clean it out, ensure there is nothing jamming it.
Clean out the water container, remove all fluff.
Ensure the float hasn't stuck.
Ensure the condenser is clean and clear, take it out and use the garden hose on it.
Reassemble the parts and try the machine again.
Hope this helps