Need some advice concerning my central heating/water boiler.
The system is fired by a Glow-worm Fuelsaver 30-40 about 25 years old.
When switched to just water (no heating) periodic banging occurs caused by air moving through pipes. Switch to both water and heating the problem goes away (does this mean that the pump is OK?). It seems as though the boiler is creating the air. No work has been carried out any where in the system and what little air there has been has been bled several times through the radiators. Is my boiler on the way out?
Any help or advice would be gratefully received, Thank you.

Fingers crossed, May 2008

system sludge generates gases too hence the bleeding requirement

iain, May 2008

sounds to me like its just really really really really 25 yr old. average life span of gas appliance 10-15 yr.

i would say its down to condition of system and system water. on both hw+ch its probably just managing to keep itself at normal operating temperature where as on just hw, its struggling to get rid of its heat hence the banging.

iain, May 2008