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My Honeywell 3-way motorised value makes a loud rattling noise. If I turn the pump up, the noise increases and if I set the pump to 1 it doesn't rattle so often. This started happening after I replaced my hot water cylindar. Anyone know what the problem may be? Could it be the pump making...

My central heating cold feed tank overflows continually; not ball valve; rad nearest pump always needing bleeding; lots of air in the system; when pump on it often streams out; set volume in cold feed to low, cleaned system out with Sentenal but still streams out; This all happened after heating...