There you go then - train fault.
Easy when you know how.
Yep. The rear pan stayed up when the front pan came down. Obviously a fault with it as once the pans go
"over height" they then come back down and sit on the roof. They have to be checked for damage and reset by a fitter by pressing a button on the roof.
Incidentally, the dual voltage buzzers were recently modified and now cannot be cancelled by the driver when changing AC>DC at Farringdon. I would imagine it highly unlikely that a driver would continue through City Thameslink with the alarm still sounding. Though the pan
could in effect be put up in error, you would have to select AC mode first (the button is covered to reduce the chance of this happening as the pan up button is also used for traction resets).
Heading north and changing DC>AC there is no buzzer. You just have to remember to pan up at City Thameslink. But it wouldn't be a major problem if you forgot as you'd just run out of juice on leaving Farringdon and would stop and pan up.