Oftentimes, homeowners can fix simple leaks in heating systems without calling a service professional.
-Soldered joints that have sprung a leak will need to be replaced. But first drain the system.
-Compression joint leaks sometimes can be fixed by tightening the nut by a quarter turn. Keep the other nut in place with a wrench, so the joint is not pulled from the pipe.
In most cases, a service professional is a wise choice and you should contact your retailer or manufacturer for help.