CH/HW sudden breakdown - pump starts overheat

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olch

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Hi guys,

I am in a new build. Central heating and hot water works perfectly. Apart from one radiator that only seems to be hot at the bottom.

This radiator is the only radiator in the house that is without one of those 'temperature spinners'. First I tried bleeding it but there was no water at all across the top half of that radiator and so nothing came out. I then bled one of my other working radiator to check water quality in the system and it is clear and clean. Then I tried turning off all radiators except the one with the problem and then bad turned worse.

CH and HW suddenly do not work anymore. But the pump still spins and makes a noise and becomes really hot. The two pipes going in and out the pump respectively are cold. I have unscrewed the screw on the face of the pump to check if the shaft is stuck and it is not. The pump keeps on doing this even with the CH and HW programme off. So I have switched power off for the pump.

Image of pump attached.
Cylinder is ThermaQ - Evocyl Standard Indirect 150L.
Boiler is Potterton Promax SL.

Please could you share your knowledge on what to do next?
Thank you.
 

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I see you have a filling link. You should also have a pressure gauge. What is it reading?
 
Hi,

Thanks for replying so quick. I don't actually know where the pressure gauge is but the closest looking thing is the meter under the red heating vessel. It reads 0 when CH is turned. Note the red needle on the meter is static and points at 3.4. But I think it was 0 when it was working fine.
 

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Open both taps on the filling loop up. Someone has kindly labelled it for you.

Turn the filling loop off when the needle currently at 0 on the gauge in your picture gets to 1
 
Do I do this while pump is on? Gauge seems to stay at 0.
 
Whenever you Bleed a radiator you need to top the pressure back up using the filling loop
 
Hi,

Just one more quick question please.

Now that the problem above is fixed, CH and HW is working great but my boiler is filling my cylinder with water without instruction. The temperature on the cylinder thermostat haven risen from 15 to 45 Celsius now. On the same thermostat I have tried setting the cylinder threshold temperature at 40 but this was ignored. Is this normal? What is it trying to do?
 
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