air is drawn in through the grill at the bottom right hand side and delivered to the heater via the fan at the back, if the front fan is blocked with hair/fluff or if the drum is impeded (belt slipping etc) the fan will not get enough air to the heater and will trip the one shot
When the stat is reset with a pin there is a chance the bi metalic strip will weld shut therefore it will be unable to trip as is intended, also each time its reset it reduces the integrity of the component resulting in more frequent failures
i know it says on here and on other sites that this is an accepted method of repair but be very careful, if there was to be a fire and it can be proved this procedure has been carried out you will not be covered by the manufacturer or your insurer
dont mean to sound like the prophet of doom but fore-warned is fore-armed
good luck
homer, August 2011