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Yes i drained the whole system after i experienced the boiler temperature quickly rising to 84 degs. Yes, the boiler temp still rises very quickly to 84 degs with both heating and hot water on. I have not touched any other valves except the two valves on the filling loop to re-pressurise the...

Failed to mention in my previous post that i used the access screw on the pump face to turn the pump. I then turned the heating on and while the behaviour is still the same but feel that half a metre of pipe downstream of CH 2 port valve or so is almost the same temperature as upstream of this...

I have drained water ftom the cylinder coil and bled all the radiators. Do not believe there is air anywhere in the system. There is an external expansion vessel fitted on top of the cylinder. I had fully drained down the system and bled air from the radiators systematically. I have turned on...

Thanks a lot Terry. How do i bleed the pump?This model has upm3 15-70 Grundfos pump.

Hello forum members. I am new to this forum. I have a pressurised unvented system. Vaillant ecoTec plus 630 system boiler with telford tempest 300l tank. Turned on the heating a couple of weeks ago and found that the upstair radiators were not heating up. Went round bleeding the upstairs...