E1 Error on LG Dishwasher (LD-2040WH)

Question

Hi All

 

We are having a problem with our LG Dishwasher. The machine is washing for about half an hour and then will stop and report an E1 error. According to the user manual this means "Water leakage in Hose connection" or "Water is leaked by damages". We have checked the diswasher's water connections and can't see any water leaking out. We have also cleaned the filers and checked the spray arms but that has not made any diffrence. Any suggestions what this error means and what we can try to resolve it would be appreciated.