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Ok thanks. Do you think it's worth adding some flush stuff for a few days? Do you think this will help the problem?

I have an alpha cb24 combi boiler. My problem is the boiler is knocking off on high temp after running for a few minutes. The upstairs rads are getting hot but the downstairs are only luke warm. I've recently changed the primary temp sensor, drained system and fitted 4 trvs. When I...