No choice turn it off and let it defrost naturally with doors open for at least 48 hrs pull it out and put some towels down you will get a pint or two of water from it at the back - don't be tempted to use hubbies paint stripper or your hair drier it will melt the plastic case unless your prepared to remove the back panel - not recommended less you know what your doing if you do don't get melt water near the hairdryer or you may get a nasty shock !
Polestar ltd, January 2011