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thanks for the reply folks. I am not sure what type of fernox i used, it was just a 1litre jar from the local plumbers. Would the type of fernox cause this problem?????? The pump is from CIRCULATING PUMPS. CP53 Code 8204E0602 Can you please tell me what the bucket test is? The...

Hi everyone I recently put fernox in my closed system through the pressure release valve in my burner. Since then the furthest away rad refuses to heat. I had trouble with the same rad when i had an open system. This was the reason i put the red tank in the attic. Since i done this the rad...