What should I do if the condensate pipe freezes during cold weather?

Locate the blockage, which is likely at the most exposed point outside the building, and thaw it using a hot water bottle, microwaveable heating pack, or a cloth soaked in hot water — do not use boiling water as it can damage plastic pipes. After thawing, reset the appliance and wait two or three minutes for it to restart. If the boiler does not restart, contact Worcester, Bosch Group on 0330 123 9339. (Page 14)

From the official Worcester Greenstar 1000 GR1000W 30C NG Boiler manual, page 14

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