The knock could have damaged a relay or the heating element for the tumble dryer. Best thing to do is try and check all the relays to check they still work (using a multimeter), and of course check for any damaged or disconnected wires.
Also, please unplug it if reconnecting wires, though it will need to be plugged in to check it with a multimeter!
Hope this helps!
Mr Smith
November 2008
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