outdoor blow pipe freezes and the furnace kicks off, how do I fix it?

Furnace kicks off in the night with the first snowy, cold night. I have 2 pipes that go outside from the furnace, neither one are insulated. I poured hot water on them, and the furnace kicked on for a few minutes, but keeps shutting off. It's cold in the house. I have a small war time house in Welland Ontario Canada.

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