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I have an unvented system (megaflow 170 litre tank) whereby the central heating system is gravity fed. The system is set up so that I can turn on the central heating and the hot water separately. When the hot water is on the bathroom radiator is designed to come on too (unfortunately so do the...

Can somebody advise? A few weeks ago I had to turn off my heating system (pumped, open vented) as the pump was screeching. I assumed that this was because there was no water/air trapped in the system. I was advised to drain the system down and refill. This I've done and have bled the radiators...