Good diagnosis - the problem you have is caused by the fan not blowing - the fan moor is probably defective - it might have stalled and need cleaning and lubrication.
A closer inspection is required...
Good luck...
Peccavi
July 2013
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix fan heaters.