6 Karen Asked: October 31, 20212021-10-31T23:05:32+00:00 2021-10-31T23:05:32+00:00In: Kitchen What does F1 fault mean on a combi boiler? 6 My combi boiler is showing F1 fault code and I have no hot water. What does this mean? boiler Share Facebook Related Questions How to fix E119 error on boiler? Why does my boiler make a loud vibrating sound? 1 Answer Voted Oldest Recent Best Answer Mary Anne (Moderator) 2021-11-01T18:19:52+00:00Added an answer on November 1, 2021 at 6:19 pm This answer was edited. The F1 fault on my combi boiler means the pressure is low. There are different ways to top up the pressure when you get F1 error code on your combi boiler, just check your boiler instruction manual or search YouTube for instructions on how to fix the F1 fault code for your boiler model. 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerLeave an answerCancel reply Save my name, email, and website in this browser for the next time I comment.