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is there an easy way to clean out the shyte without stripping out the heat exchanger

the pump runs ok but the system wasn't cleaned

I have just had a ravenheat boiler CSI 85B(T) installed. The problem is that the boiler will fire up okay and then after a few minutes the overheat/flame failure light comes on and then nothing works. It does this on both the hot water only selection and the ch and hw selection. I have to switch...

This boiler is old and is now leaking intermittantly from the safety valve. There also seems to be a slow but constant loss of pressure this maybe due to the leak but i think it's a seperate matter