Glow-worm Flexicom problem

[ChrisR]

there has always been a Magnaclean on return to boiler.

Have a look inside it then?

There has always been Sentinel inhibitor in system.

IIRC they say replenish every 2 years. It can get used up by fresh oxgenated water entering.

 

[Robert Handscomb]

Did this ever get fixed? I have exactly the same problem. The boiler temperature slowly drops, maintained by the heat from the hot water cylinder, which is also distributed around the house radiators (S plan, both valves open), until around 43deg. Hand on pipes confirms the water is being heated and circulating when the boiler is burning. All comments so far seem to address different problems, not this one, so I assume it is not particularly common... Any help welcome.