Indesit Dryer ISL70C starts ok but after 10mins the lights start to flash? ?

I have an Indesit ISL70C dryer - and everything seems fine on the start up - the dryer runs and operates - the rear panel gets hot - after about 10-15mins the alarm sounds and 3 lights start to flash - empty water, alarm and time delay - the over temp light doesnt light up.
The water collection is empty, the pump at the rear seems to be working - the condensor unit at the rear is clean and clear no blockages

Has anybody got any ideas? or is it the scrap heap?