Hi,
I moved into a new house 5 months ago and the downstairs rads never get hot, whilst the upstairs ones get warmish. It's an 'open' system that's around 15 years old and I don't know if inhibitor was used correctly. I decided to drain the system down and remove all the rads, flush them out with a hose, replace them and add some sentinel x400. The upstairs ones are definitely warmer and I'm happy with them, but the downstairs ones are still stone cold, so I'm not sure where to go next? There was some very black sediment in all the radiators, but this mainly came out in suspension when flushing through, rather than really thick sludge that I'd been expecting. I only refilled the system last night so should I wait and see if the Sentinel does anything? The fact that the downstairs rads are stone cold makes me think that this is a long shot! The pump has 3 settings and it's currently on the lowest- I was advised not to turn this up but could that be the problem?
This is my first attempt at plumbing and I was prompted by the high quotes and un-convincing advice given by the plumbers that I've had round (no offence to all you decent proffesionals out there!)
thanks Charlie