Lg condenser dryer?

Help....! My lg condenser dryer has stopped heating for the second time in 48 hours. Having looked at this website we reset the little red button, hoovered all the crappy bits out, dust etc too, cleaned out the filter at the bottom of the dryer, all the lint traps cleaned and water emptied. I put my first load in and yes I might have put a bit too much stuff in, at the really dry cycle (synthetics) and at 11 minutes left the bleeping began. I turned it off and emptied it out and left it. I put my washing in today and less than 48 hours later the heat has stopped. Is it an over heating thing? Or a more sinister problem that requires lots of money?????? I'm not sure what model it is but it's about 3 years old (sorry it's a TD-C70040E)