Problems with small bore pipe and an old central heating system

[Ben-gee]

Use your magnet to investigate extent of blockage, depending on what you find- cut out and replace that section of pipe

 

[jh2254]

 

[jh2254]

Update. Central heating has now been running ok for the last few weeks with X800. Every few days I have been cleaning out the two magnacleans I installed. Last time was today after I left heating on timed (one hour in the morning and one hour in the evening) for the last 8 days. It collected magnetite as per the photos attached. Should I leave the X800 in for a few more weeks until it collects no more magnetite or drain and fill with inhibitor now ? Many thanks.

 

[jh2254]

Update. Now into December and with the X800 still in system I continue to collect weekly amounts of magnetite. See pictures. When is the right time to drain the system and add x100 ? Many thanks.

 

[jh2254]

Update (October 2023). System still running perfectly. I drained down in the summer and put new inhibitor in. Recently powered up and the central heating is running well. Still collecting the debris in the 2 magnacleans I fitted at the troublesome spots on the system (entry into the small bore pipes leading to the radiators that did not heat up) but I dont mind cleaning them out every month. Rather this than spend £2k on a power flush that is not guaranteed to work and may cause no end of problems on my 40 year old multi pipe (normal and small bore) system! Learnt a lot on this forum and if I had my time again would not have allowed these so called 'professional plumbers' to install small bore pipes in my system!! Thanks again. Cheers.