I have a Vailiant Eco Max Pro 28 which was making a noise - sounded like it was constantly on even though there was no demand for heating or hot water. I turned it off and left it for a few minutes then when I have turned it back on it is flashing red and showing a fault code of 11.
I know I need to call someone in but wondered if anyone knows what this fault is and if it is going to be expensive.
I know I need to call someone in but wondered if anyone knows what this fault is and if it is going to be expensive.
