Boiler losing pressure, need help finding the cause (leak?)

ThisIsWeird

Hi Macci.
Could you start a new thread, please, and give us full details of what's going on?

macci85

Sure, just done that, thanks!  

ThisIsWeird

And FULL details given too!

ThisIsWeird

Any update, Bullit?
With your CH presumably running more often, is the loss a greater problem?
If it really only (or largely) occurs when the CH is being used, and the rads are hot, then I guess it does most likely point to a dodgy filling on the read pipework, such as a poor solder joint, that opens up a fraction when the pipes are hot.
You - or a plumber - have not yet tried isolating the boiler from the rads?

Bullit_2600

Hi @ThisIsWeird, last winter up until April we were still topping up the every few days.  It was off until November with nothing else done and since we started using the heating again (in November) we have not had to top up the pressure once.  Very strange and very hard to confirm what the issue and resolution was. Maybe a combination of everything.

ThisIsWeird

Keep an eye on the boiler pressure between hot and cold, see it it fluctuates much.