My condenser boiler stopped working today and showed up fault F1. Gas supply fine as gas cooker working.
After a long look I found it was the condensate outlet had frozen up. I cleared the ice from the pipe and now heating working again.
The other possible faults are gas valve and full auto faulty but they were all fine. Hope this helps
I also cleared the ice from the condensing pipe (white pipe under the boiler) this pipe was full of water. But further up the waste pipe it was solid with ice..
Mike from Stockport, December 2010
