Wet underfloor heating clicking?

[bilbodog]

If piglet john is around - our ufh seems to be having problems, not getting very warm - it seemed ok yesterday, and now there is a clicking noise coming from the cupboard housing all the pipework.

Any ideas - weve not had ufh before?

I don't know UFH, sorry.

See if you can find out who installed or maintained it. There might be a sticker or card on the boiler or controls.

clicking might be that it is trying to open a valve and not working.