In very cold weather and when the temperature is below freezing, boiler condensate pipes can become blocked with ice, this blockage can prevent your heating system from working correctly. Watch this video from Viessmann to learn how to identify an issue with a frozen condensate pipe and what you can do to fix it.
Work on gas appliances should only be carried out by qualified operatives, for more information visit www.viessmann.co.uk/heating-a...