condensor dryer only works 10 mins at a time?

Electra 37527 condenser dryer only works for 10 mins at a time, will continue work if you hold in the start button button, but will work again if you leave it 10 mins or so before pressing the start button, again will only work for 10 mins or so. Is still drying clothes ok though!
If you take out the condenser element in the bottom and stand it up it seems to have a small amount of water in it!! Never noticed this before.
Would be able to fix myself if I had some idea of what I was looking for, can anyone help????