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hi thanks for the reply, i have left it for a few days and the problem still exsists,rads have been bled and air came out but it is still happening can it be anything else? thanks for taking the time to answer and help me steve

Hi can anyone shed any light on this. I drained down a vented system to replace a faulty three port valve, along with replacing my rad valves with trv's. I fitted 4 out of the 6 rads and refilled the system. Now my boiler makes lots of noise and only heats two of my rads and then shuts down...