hot flow cold return

[alib100]

hi.im doing my nvq3 in plumbing . on a regular heat only boiler that overheats and shuts down if the flow leaving boiler is very hot and return cold or lukewarm that shows water isnt circulating around. first port of call would be toinspect f/e tank is ok/or enough pressure in sealed system, second is pump running and thirdly airlock? have i got that correct. ? thanks you. basic i know but weve all got to start somewhere

 

[Goldspoon]

Welcome to the forum.

I really do try not to be a pedant but your post is hard to read. A few simple rules will really help us read your posts. Using a capital letter at the start of a sentence and full stop at the end should surely be a minimum standard for any poster. Your post reads much better with just a few minor modifications:

Hi. I am doing my NVQ3 in plumbing. If a regular heat-only boiler overheats and shuts down and the flow leaving the boiler is very hot and the return pipe is cold or lukewarm - this shows that water is not circulating. First port of call is to inspect if the f/e tank is okay - or if it is a sealed system see if there is enough pressure. Second would be to check if the pump is running and third would be to assume an airlock might be present. Have i got this correct? Thank you. Basic i know, but we have all got to start somewhere.