Ideal Logic+ losing water pressure. Increasingly often.

[garnet]

Hi all,

My Ideal logic loses heating water pressure. It started with needing 7 day between toping up pressure. Then it went to 3 days, now it is 32 hours.

What I've checked:
All radiators and piping above the floor - no leaks.
PRV pipe outwide with a plastic bag tied to it for a week - no leaks.

What I havent checked:
Under the house pipings - it is ground floor with 50 cm clearance to the ground, but there is no access.
Condensate pipe - is is coverred behind some furniture and I dont have access. Is there a way to check it in the boiler?

What might be the problem? I have read a few threads and possible options are main heat exchanger and expanson vessel. How can I test those?

Help appreciated.

 

[CBW]

Expansion vessel usually if the pressure rises when heating on. Try isolating the flow and return valves overnight, if it drops with them closed - boiler, so possible heat exchanger leak. If it maintains pressure, but drops when you open the valves it’s on the heating circuit.

 

[muggles]

If it's an older model then they're notorious for failed heat exchangers. There is a simple way to diagnose it but it requires removing the front cover, which should only be removed by a Gas Safe Registered engineer.