I adjusted something at the top of the boiler which has 3 settings, I thought it was the speed of the pump, may have made it worse not sure, it fires up but no hot water now but CH is working, I have a megaflow water system. Can anyone help please with a quick fix or do I need to call someone out?

Stephen, April 2010

could be the pump that you adjusted, doubt it was a mid position valve as unvented systems usually require s plan system. may be best to get someone out for a look. advise them on the type of system you have, if the cylinder or any of it's controls need to be worked on they will need another qualification.

Ian, April 2010