Is it OK to use a tumble drier with nothing in it?

I have a washer/drier, a washing machine with built in tumble drier. The waste water goes outside in a pipe, and this pipe has frozen. The warm wet air from the drier also goes out the same way. So... is it OK to put the machine on a drier cycle, so in theory the warm air goes down the pipe and defrosts it? I ask... show more I have a washer/drier, a washing machine with built in tumble drier. The waste water goes outside in a pipe, and this pipe has frozen. The warm wet air from the drier also goes out the same way. So... is it OK to put the machine on a drier cycle, so in theory the warm air goes down the pipe and defrosts it? I ask because for example, you shouldn't put a toaster on with no bread in it, and a microwave with nothing in it etc.
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