Zanussi 1200 XC failing on dryer cycle?

My Zanussi 1200XC washer dryer has developed a fault where it no longer completes a drying cycle. The wash cycle seems fine, but when I put it on to dry it only manages ~10 minutes and then it stops. No error messages, the time displays 0 as if it has finished a full cycle. I've tried all the different preset dryer programs as well as the timed program. Any ideas what is wrong?