Hey all,
Really hoping for help. My boiler won't stay on for more than a couple of minutes (I think self-defense, overheat prevention) and my grundfoss pump makes noises as if it has air trapped in it. However, opening the bleed valve on the face of the pump doesn't seem to fix anything. I can't think of what else to try.
A bit of background:
I drained down the central heating to replace a rad and install TRVs on a number of rads. The system is has an F&E tank in the loft, feeding an ideal classic boiler. The boiler heats the water tank and the central heating via Grundfoss Pump. No new pipework, just new valves and a one in one out on the radiator (slightly bigger rad).
I refilled from the bottom up with each rad bleed screw closed until I filled that rad. Rads all appear to fill from both feed and return sides. But as above, I can't get the boiler to stay on for more than a couple of minutes and water proceeds around the system at snails pace. 3 or 4 upstairs rads get hot, but I'm left with the overriding impression that the pump isn't really pumping and has air trapped in it. I've tried twiddling the bleed screw relentlessly with the heating both on and off, but still it sounds like air is in there
I've re-drained and refilled the system a couple of times and am now at a complete loss.
Any help would be amazing, from a desperate and soon to be cold showered DIYer.
Cheers
Really hoping for help. My boiler won't stay on for more than a couple of minutes (I think self-defense, overheat prevention) and my grundfoss pump makes noises as if it has air trapped in it. However, opening the bleed valve on the face of the pump doesn't seem to fix anything. I can't think of what else to try.
A bit of background:
I drained down the central heating to replace a rad and install TRVs on a number of rads. The system is has an F&E tank in the loft, feeding an ideal classic boiler. The boiler heats the water tank and the central heating via Grundfoss Pump. No new pipework, just new valves and a one in one out on the radiator (slightly bigger rad).
I refilled from the bottom up with each rad bleed screw closed until I filled that rad. Rads all appear to fill from both feed and return sides. But as above, I can't get the boiler to stay on for more than a couple of minutes and water proceeds around the system at snails pace. 3 or 4 upstairs rads get hot, but I'm left with the overriding impression that the pump isn't really pumping and has air trapped in it. I've tried twiddling the bleed screw relentlessly with the heating both on and off, but still it sounds like air is in there
I've re-drained and refilled the system a couple of times and am now at a complete loss.
Any help would be amazing, from a desperate and soon to be cold showered DIYer.
Cheers