Glowworm 30 loses pressure slowly

[pjs2k04]

Hi
Disclaimer: i am not a plumber.
My flat has a glowworm 30 boiler which is about 8 years old approx. It is serviced annually by BG and holds a gas safety cert currently.
The boiler provides on demand hot water and also handles underfloor heating for a 2 bed flat.
The boiler seems to be losing pressure but reasonably slowly. I estimate that there were around 5 weeks between the last time i topped it up to it losing all pressure. I topped it to 1.5 bar.

Are there error codes that might help? Any other suggestions appreciated.

Thanks in advance.

 

[lame plumber]

first what BG do isnt a service, more a safety check so any issues probably aren't dealt with. So your issue will need a gas technician to resolve so call out bg a few times and if no luck call a technician locally to resolve the issue.

 

[Dotty]

Job 38.11