Got yet another call for the Vaillant Eco tec F75 fault code this week in North london, N12.  We get a lot of calls for the F75 code, it is a very common problem with the Eco tec range. The problem with this fault is that there are a number of things that can cause the F75 code, luckily we are experts with vaillant boilers and the F75 code so give us a call and we can solve this problem for you!!