F5 now clunking Glow worm 18hxi

[Brian49]

Hi all
As of this week I had an F5 overheat this was reset two days ago Now I'm getting really loud clunking when heating comes on Hot water is fine. Any ideas. The boiler is about 6 years old.

Many thanks

Brian

 

[Agile]

Restricted heating flow rate?

 

[Brian49]

Restricted heating flow rate?

. Hi Agile could you expand please?

 

[Agile]

I have not see your system!

So this is only a possibility!

Not enough flow through the heating circuit to take the heat away from the heat exchanger followed by an overheating.

Tony

 

[Brian49]

I have not see your system!

So this is only a possibility!

Not enough flow through the heating circuit to take the heat away from the heat exchanger followed by an overheating.

Tony

Many thanks for your comments

Cylinder upstairs grundfos 15-50 pump The Glowworm in Kitchen downstairs small 3 bed house 7 Radiators in total. Typical when you start using the heating when weather changes

 

[Agile]

I always recommend that heating is run for five mins every 3-4 weeks to prevent motor valves sticking and to ensure the system still works!

Tony