Filling loop and Megaflow low pressure

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Hi all, had a leaking filling loop which I have replaced. Issue I have now is the pressure is low. We have heating downstairs but rads are not working at all upstairs. I have checked the screw on the filling loop Valve and repressurised the system but still not able to increase the pressure which I have done many times previously on the old filling loop.

Am I missing something?
 
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Possibly. Show us pics of the filling loop and pressure gauge.
When bleeding upstairs rads do they give water out or not ?
 
Possibly. Show us pics of the filling loop and pressure gauge.
When bleeding upstairs rads do they give water out or not ?
Thanks, appreciate fast reply
Rads upstairs give out water, rad in loft con dont
 

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Did you only replace the braided flexible hose ,or the two valves at either end as well ? Your system obviously has a lot of water in it and some pressure showing on the gauge ,how did it get to that point ?
 
Did you only replace the braided flexible hose ,or the two valves at either end as well ? Your system obviously has a lot of water in it and some pressure showing on the gauge ,how did it get to that point ?
I left one valve at the water shut off point which appears to be working. Pressure has stayed at this level since changing the filling loop.
 
Can you post a better view of the pressure gauge if it is part of a PRV (pressure reducing valve), if there is a PRV, it can be adjusted, normally, there is a shut off valve (knob) directly underneath with a pressure adjusting screw on the top, maybe under a plastic cover.
 
Is it the valve with the slot for a screwdriver and a black lever,that you changed ?
If it is, is it connected to the cold water mains ? If so ,there should be an arrow embossed on the valve body to show direction of water flow. You may have fitted it incorrectly,it will only allow water to flow in one direction.
 
Can you post a better view of the pressure gauge if it is part of a PRV (pressure reducing valve), if there is a PRV, it can be adjusted, normally, there is a shut off valve (knob) directly underneath with a pressure adjusting screw on the top, maybe under a plastic cover.
Hope this helps
Is it the valve with the slot for a screwdriver and a black lever,that you changed ?
If it is, is it connected to the cold water mains ? If so ,there should be an arrow embossed on the valve body to show direction of water flow. You may have fitted it incorrectly,it will only allow water to flow in one direction.
yes that’s the one I changed I basically copied the old one when fitting. Could I have got this wrong?
 

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Yes ,you could. Check the body of the valve for an arrow,it should point away from the copper pipe it's connected to.
 
If you remove the Flexi hose from that valve and turn it on ,does water flow out from that valve ?
If it doesn't,it's faulty or you are wrong about the arrow
direction !
 
As above, also, there is no PRV on that system, is it fed from the mains or from a upstairs cistern?.

Also remove the plastic levers from the filling valves and check that the spindles are actually tiurning.
 
Last edited:
If you remove the Flexi hose from that valve and turn it on ,does water flow out from that valve ?
If it doesn't,it's faulty or you are wrong about the arrow
direction
Just removed and water flows out.
 

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