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Hmm KingDoey it's kinda funny because I did think it was an airlock but that PP was convinced it's sludge. I find it interesting how if it is an airlock, bleeding rads doesn't solve the issue...
Because as said before bleeding rads won’t always clear an airlock. It all depends how the system is piped
You need to set do a combination of things like cycle the pump vent the heat exchanger etc. Gradually force the heat round the system one radiator at a time. It’s not always a ten minute job