ELECTRIC OFF.lid off.on the silver bit in the centre (dryer duct) is a resettable thermostat.try pressing red pin in hard.you can then retry.if it pops again you have a blockage which is likely to be in the condensor tank down the righthand side as you look from the front.possible heater failure but not that common!
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix washing machines.