condensor dryer fault

[graemesams]

Hi, I've got a Hoover TC650 tumble dryer. The fault is that as soon as the machine is switched on, the "filter care" light illuminates. The filter and condensor are both spotlessly clean. Could anyone point me in the right direction of what to check next? I would have thought there'd be an air pressure switch somewhere, but it looks as though I'd haver to strip 90% of the machine out to get to most of the innards. - Any help or pointers of best approach would be appreciated. Anyone got a service manual? Cheers in advance, Graeme.