Hi all! Need your help badly! Cant find anything on net about this fault. Basically few days ago my thermstat control had F4 on it. I reset boiler and it worked, but then nxt time i can in from work it had it on again and now its on all the time. Does anyone know what this fault is please! Just annoyed since i recently had my PCB changed and dont want fork out a fortune again. thanks in advance

MickyF, June 2008

I had similar problem earlier this year. After several visits from BG engineer problem identified with a blocked condensate trap. Ideal recommend that this is cleared regularly, but BG do not include that as part of the 'service'! Instructions for servicing, including clearing the trap, are included in the installation booklet.

Frankie, July 2008