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cheers for that zk, I have checked rads for air and they are ok. All rads were previously warm as should be. What parts can cause circulation problems? Could it be a problem with the diverter. ( listen to me you would think I knew what I was talking about... NOT). :oops: Any suggestions...

My boiler switches off once it reaches temperature, after it cools for a few mins it then switches back on. I have changed the CH sensor but this has not fixed the problem. The CH thermostat knob has been missing for some time therefore i do not think this is a factor. There is hot water on...