The return pipe is hotter than the flow?

sorry vince, to find out flow and return turn the heating on.

A.
November 2007

I had this problem on a recently installed central heating system (One week old). The engineer called and found that the flow and return pipes had been connected the wrong way round. If you first identify from the installation manual which is the flow and which is the return, then turn the heating or hot water on ,the flow pipe should get hot first (the return pipe soon after) but you have to be quick when you feel the pipe.

A.
November 2007

Are you sure that you have got your flow and return pipe and boiler connections correctly identified and the right way round?

Martin
November 2007