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- 22 Apr 2016
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Replaced a few radiators and am having trouble now that I have refilled the system.
The last two radiators on the loop (downstairs) are not getting hot. And I can't fathom it out, full description of what I did and what I've tried follow:
1. Drained system (expansion tank fed)
2. Replaced 4 rads various locations.
3. Refilled system and added Sentinel X800 Cleaner
4. Ran boiler for about 2 hours.
5. Drained again and let it flush through until outflow pretty much clear.
6. Refilled in order as follows; upstairs rads off, bleed downstairs 1 by 1, open upstairs and bleed, bleed valve next to pump. Also added Sentinel x100 inhibitor.
7. Switched boiler back on. All rads hot except last two.
I tried switching all the others off (at least all that I can a couple have seized valves) but that hasn't solved it, also cranked the pump up full but no change. Here's the bit that is really puzzling me. The last rad has a drain point and if I open it the water flows through and the radiator gets hot but as soon as I close it back off it goes cold again. The one before also gets hot if I bleed it for long enough but again it goes back to cold afterwards.
One is new and the other is old, neither has a TRV any suggestions?
Thanks
The last two radiators on the loop (downstairs) are not getting hot. And I can't fathom it out, full description of what I did and what I've tried follow:
1. Drained system (expansion tank fed)
2. Replaced 4 rads various locations.
3. Refilled system and added Sentinel X800 Cleaner
4. Ran boiler for about 2 hours.
5. Drained again and let it flush through until outflow pretty much clear.
6. Refilled in order as follows; upstairs rads off, bleed downstairs 1 by 1, open upstairs and bleed, bleed valve next to pump. Also added Sentinel x100 inhibitor.
7. Switched boiler back on. All rads hot except last two.
I tried switching all the others off (at least all that I can a couple have seized valves) but that hasn't solved it, also cranked the pump up full but no change. Here's the bit that is really puzzling me. The last rad has a drain point and if I open it the water flows through and the radiator gets hot but as soon as I close it back off it goes cold again. The one before also gets hot if I bleed it for long enough but again it goes back to cold afterwards.
One is new and the other is old, neither has a TRV any suggestions?
Thanks