I think TMH meant overheating of the motor.
I loaned a builder an extension reel for use with his steamer. It never occurred to me to say that he needed to unroll it all for a heavy usage appliance like that. I thought it was obvious, besides it being written on the reel.
A few minutes later, the ring main went off, and I found that the extension reel had melted completely, just a pile of melted vinyl and conductors on the floor.