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Hi I want to flush CH system after adding x400 and leaving it for a 3-4 weeks. I'm planning to open drain valve while opening the mains water into CH system, hence flushing (not draining), one rad at a time. Correct me if I'm wrong. My challenge is that automatic bypass valve will not allow...

Hi I'm planning to add MC5+ cleaner to the system as there is a lot of sludge & rust. My concern is that since magnaclean is fitted to flow, the boiler may end up with debris and create problems. I'm planning to drain the system in a week's time and at that point will change the pipework...

My Vaillant vcw-sine T3 stopped firing yesterday. Reading the posts on the forum I switched off the pilot light using the red button. However, unable to light it up now by pressing green button and turning the spark generator. Any advice is much appreciated. I see a lot of owners for this...