Housing conditions and rights for tenants

How to defrost a frozen condensate boiler pipe

You may be able to thaw frozen condensate pipes without having to log it as a repair, if you follow the guidelines below.

Thawing your condensate pipe:

  • use hot water – not boiling – heated by a kettle or a microwave and pour over the end of the pipe where it is frozen using a suitable container like a watering can
  • hold a hot water bottle or heat wrap around the condensate pipe
  • once the pipe has thawed you should re-set your boiler by holding in the re-set button for 10 seconds and wait for the boiler to re-fire

You can watch Worcester Bosch Group's self-help film to help you understand how to do it.


  • never attempt to thaw a condensate pipe above waist level, or disconnect the condensate pipe in order to do so
  • never attempt to access the condensate pipe or any other pipe work within the boiler
  • beware of ice on the ground that will form from the water you have poured

If in any doubt, phone our Housing Repairs team on 0800 074 0263.