Some of the older heaters have a thermal cut out in them (usually triggered by someone putting clothes on them to dry - the vents must be kept clear), newer ones have automatic resetting cutouts. ensure power is off, take off cover and just below the controls there may be a circular disc (about the size of 2 pence piece) with a white button / peg in centre, press and if you hear it click you have reset the thermal cut out
Paul Hewitt 07710692532, December 2011