Hi my Znussi ZWD1270S wont dry and has E10 error code?

Hi there My washer dryer has stopped drying and when it does get to the dry cycle it stops counting down and then gives me an E10 error code afet about 5 mins. I have read a few other threads on here and people seem to say that a valve on top of the machines plays up, I have checked the obviouse like squased pipes and loose connectors.

If anyone can throw a little more light on it would be fantstic :-)

Thanks Will B