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Thank you for connecting the dots JonathanM. To answer your question: yes, he came in with the F3. Poured the whole bottle in the water trough in the loft and left. He said it would take between a week and one month for the noise to reduce. It did but the boiler still kettles. That's right the...

As an update: The reason the boiler can't remain on when it tries to fire back up is because on the display you can see the temperature rapidly rise from say 40 degrees Celsius to 65/66 within 5 seconds and so it shuts down immediately as it thinks it's reached the set temperature. It seems it...

Thank you for your considered response, Marty. From my end, I would like there to be less issues that I have to deal with and that usually means saving the landlord money. I have found that the more new works are carried out, the more errors I've had to fix. Which ends up costing the landlord...

Thank you very much for the advice martygturner. I think I found it difficult that the tradesman was giving me wrong information because my decision making is then based on that and also it means he's not qualified to give the correct advice and so every future work is not carried out well. This...

Thank you very much CBW. We have had this new pump around 7 months. It is only in the past week the boiler fires up and then turns itself off. I wonder if the pump is fine, otherwise issues would have been apparent earlier?

Thank you very much for the advice martygturner. I think I found it difficult that the tradesman was giving me wrong information because my decision making is then based on that and also it means he's not qualified to give the correct advice and so every future work is not carried out well. This...

This is a better picture. I will check pump speed later- my worry is if it's increased, that very loud vibrating sound which transfers to other rooms will return. I am not sure where the valves are but if they are fully open does this contribute to the boiler firing up consistently without...

Really? Take a long look at yourself.

Thank you CBW, yourself and JonathanM are absolutely correct, the 3 port valve is sitting above the pump. Since it was the pump that was replaced this year, and the speed lowered, we can discount that, yes?

Aha, thank you JonathanM. Let me find a pic.

Thank you martygturner. 1. Is system cleaner the Fernox F3 cleaner, I mentioned above? And how does it get flushed? I remember when the tradesman came out he only added the F3. Nothing was done after. 2. After doing the above. What could be the potential boiler faults? Yes about inefficiency...

Hi CBW, where is this pump located? If you mean the three port valve, it was replaced this year.

Out of my very long and genuine post, this is the only point you decided to discuss?

Hi all, Lots of info below and then advice on what to do, please: The boiler is a vaillant ecotect plus 415, open water system, water tank in loft, cylinder in bathroom. There are 7 radiators in the house. Previous issues with the boiler: loud kettling which was reduced by a Fernox F3 cleaner...