halstead boiler wont ignite for heating water.ok with CH though?

I had similar problem on same model in Dec. Although the problem for me was other way round. ie; heat hot water but not radiators.
I narrowed down the fault to the motorised valve that was stuck on one side (hot water).
Got new valve from Screwfix £79, replaced and all OK.
Just in time for xmas.
Good luck

Alan
January 2010