I switched on the FBH the other night before leaving work as a heavy frost had descended. I ran it on two cycles, so it effectively ran for an hour. Not a wise move- came out a defrosted warm car and it wouldn't start! Went first turn of the key off jump leads though.
Lesson learned there!

Been there done that...... Forgot I had run it one day and not gone out in it, then ran it a couple of days later which resulted in only just starting! There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
Fiat 500x 1.4 multiair Lounge 2015
2010 LR D4 Commercial 2.7 TDV6

Most are lucky to get 10mins out of their radio and you expected it to start after an hour long FBH session...