The manual says...
There is a safety thermal cut-out device
fitted to the unit. If the unit is allowed to boil
dry this will operate and prevent further use.
Switch the unit off and allow it to cool for at
least 5 minutes, refill with water and then
switch on again - the thermal cut-out should
automatically re-set. If this has not re-set
allow a further cooling period.
http://www.templetons.ca/images/pdf/wallpapersteamer.pdf
Good Luck..., August 2016
