Powerflush

I have a 4 year old Baxi Platinum 33He combi boiler (sealed system) and 8 new radiators and a towel rail as well as a Magnaclean, they were fitted to some existing pipework but a full powerflush was carried out.
I had luke warm water coming out of the taps and everytime I used the taps my radiators would get hot so was advised it was a faulty diverter.
The Baxi engineer called under warranty and replaced the diverter but said the system/appliance was contaminated with sludge debris and the system needed a powerflush or the diverter will get damaged again, he was not after making more money as he said Baxi engineers do not do powerflushes and said to use the original installer.
The radiators all work great being hot from top to bottom, no cold spots, the system has an inhibitor in it so should I go for a powerflush?
Have also been advised that if i dont get it powerflushed and need a Baxi callout again they may charge me!
Funds are tight so if need be I will hire a powerflush and do myself, I am a competent diyer and have done plumbing so guess wont be beyond my capabilities.

Has the filter been cleaned annually? If it's fitted correctly then you should get very little/no sludge in the boiler. In any case, it's lasted 4 years.. if you have to call Baxi out again it'll be out of warranty in another 4 years and would be chargeable anyway!

You say the installer power flushed the system.

Did you actually see him power flushing it? If so how long did he do it for? While the pump was running what was he doing?

Its not just a matter of bits of dirt in a system. Diverter valves usually seize up as a result of deposition of copper oxides out of solution. That's as a result of a lack of effective inhibitor. Do you know what, if any, inhibitor was used in your system? Do you really know if any was put in your system?

Has the boiler been serviced? Has the inhibitor been replemished at, say, the third year service? Have you ever drained the system?

You think that you could do power flushing yourself. I would doubt that you could do it very effectively. I would question if you have been on any course and had any experience power flushing while working under an expert. Or even know the best chemicals to be used in your case.

Tony

If you did the Powerflushing yourself you would probably make a much better job of it than the average tradesman, who sets the machine up and leaves it - whereas each radiator is meant to be opened one at a time and the rads ideally agitated with a tool.

I don't know why a diverter valve, in preference to any other part of the boiler, would be particularly susceptible to 'copper oxides out of solution'.

Perhaps Tony could explain why we should be so worried about them and why they find diverter valves more attractive than all the other parts of the boiler.

We powerflush every other day in our boiler install business and I can't recall seeing any copper oxides, loads of magnetite though.......