I recently fitted a new water pump and when I turned the boiler on again it flared,died down flared died down and will not light properly. Nothing on or in the boiler was touched during its off period, which was about an hour. I've tested the air pressure switch which seems to be working ok. Do you think it's the thermocoupler? Regards. Sid

Sidney Pollard, May 2008

could there be air in the system water (youd hear some sloshing)

T, May 2008