Glowworm Fuelsaver Complheat 80

[mikeuns]

Hi, I hope someone can advise me... I've got a Glowworm Fuelsaver Complheat 80 Boiler - sealed system and it has been installed for about 6 years. I'm seeing a somewhat errratic fluctuation in pressure in the system (as shown by the pressure reading on the boiler) and have to quite frequently (every 2-3 weeks?) top up the system with water. There are no obvious leaks anywhere I can find.

Could this pressure drop be due to air venting or is there some other possble reason? Slow leak from valves that evaporates?

Any advice gratefully received. Thanks.

 

[Rob]

expansion vessel charge could be low. the waters probably leaving the system through the safety valve to outside

 

[mikeuns]

Following an earlier post think my expansion vessel charge could be low resulting in pressure loss. Does anyone know how to set this/correct this?

Thanks.