Please try this:-
- Power the cleaner off.
- Unplug the pressure hose from the wall. It is a bayonet fitting that undoes anti-clockwise. Try pushing it in gently as you rotate it to undo as you may need to unlock the lugs of the bayonet.
- Clean the little mesh filter that you find inside the bayonet fitting. Don't force it out or you will break the plastic frame. The stainless mesh can also be sharp. Please be careful.
- Re-assemble and reconnect the hose.
- Re-enable the cleaner.