the problem i have is when i turn my heating on i have hot water but no heating but if i tap my circit board it kicks in the make of the boiler is falcon G.C. NO:47-26701 fer
Either a bad soldered joint or possibly a faulty relay which accounts for the most circuit board problems
TC Jones / TC Jones Heating and plumbing, December 2008
Spooky - Just after entering my answer below I noticed my radiators were cold (pilot on but boiler not firing) - took out PCB from boiler and found one very poor soldered joint and a couple of suspect ones - an hour later the main burner is alight!
Peccavi, December 2008
Sounds like it might be a poor soldered joint (or several perhaps). You might try to repair it before buying a new or replacement one - e-bay is a good source and there are some small commercial companies who offer re-conditioned PCBs at a fraction of the new cost on an exchange basis.
If you do decide to replace it yourself take digital camera pictures in case you get confused during the reassembly.
Search using the part number of the PCB assembly if you want to check prices.
If unable to solder find a friendly neighbour.
Although not your boiler - this string shows you what may be involved...
http://kaijaks.co.uk/blog/nick/2008/02/10/dodgy-old-boiler
