Heating on timer will not start in morning, off for about 8hrs during night with hardly any hot water use & get F1 error in morning, Ok starting later in day approx 6hrs with only hot water usage. condensate discharge has been cleaned & emptied & everything fine for short while - now error back. Seems to be heating side causing the problem, sometimes ignites if run hot water 1st - can anyone help please....?

gillianj59, February 2013