How do I thaw the frozen (condensate) pipe from my boiler? 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. You will need to be registered for your online account to view any of our other useful self-help films - have your tenancy reference number to hand. Warning 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 OneCALL on 0345 8 507 507. Keywords gas ; frozen ; boiler ; unfreeze pipe ; fix ; repair ; mend ; blocked ; unblock ; external ; pipe ; gully ; gutter ; condensate ; pipe Related links How to defrost a condensate boiler pipe video