All Radiators Heat Up With Hot Water On Sometimes Only Bathroom One

[Ed51]

We need to know which port is feeding hot water and which port is feeding radiators please, in your install.

We know which ports are supposed to, but it may be that it is plumbed "back to front" , so to speak.

Hi, thanks I lifted 3 floorboards  pipework is,shall we say quite convoluted under there  

I could track what pipe went where, only if took up lot more floorboards in several rooms, which is unpractical I'm afraid. Is there some other way to detect the possible back to front. Four years ago installed, too long to ask them to come and rectify their mistake.

Uum.

 

[Sharpend]

Don’t lift floor boards. 

Make sure system is cold, then switch hot water on and feel the pipes on ports a and b, see which pipe gets hot then see if the rads or taps get hot. This will determine which pipe is feeding what. 

??