Hello there,
I had a blocked cold feed which took some time to get sorted courtesy of the first BG engineer being a numpty (he backfilled the system to get it working again). The second one cut out the relevant bit of pipe and cleared the blockage, the system refilled and all seemed good.
One result of this was a dose of Sentinel x400 entering the system (I had tried this not realising there was a blockage, so it just sat in the F+E tank for a couple of weeks while BG got its whotnot in gear). I do not know if it is a full dose, but the water in the tanks is an interesting shade of ditchwater at the moment. (I am guessing there is/ was a fair bit of crud in the system, despite the rads heating up properly and any 'bleed' water being nice and clear until the x400 arrived).
I was happy to let the x400 do it stuff for a bit and then drain/ refill.
However, I am now getting an odd throbbing noise (a bit like a badly tuned engine idling - thrum-thrum-thrum) in my bedroom radiator and to a lesser extent a nearby one. It starts around 30-45 mins after system start. It lasts anything from ten minutes to an hour, rising in intensity and then easing off, finally stopping - but comes back every now and then.
Both boiler and pump sound normal (silent in the pump's case) while this is happening.
I thought it might be the pump grinding, but the BG man (the same guy who fixed the original problem) reckons it is scale (and therefore not covered by Homecare). Does this sound right?
I was thinking of leaving the x400 to do its stuff until after xmas (time!) and then having a crack with Fernox Heavy Duty Restorer or similar.
Anything else (or better) I should do/ expect?
(It is an old system with an old Apollo Fanfare boiler - late 80s council installation)
Thanks for any advice,
Ian.
I had a blocked cold feed which took some time to get sorted courtesy of the first BG engineer being a numpty (he backfilled the system to get it working again). The second one cut out the relevant bit of pipe and cleared the blockage, the system refilled and all seemed good.
One result of this was a dose of Sentinel x400 entering the system (I had tried this not realising there was a blockage, so it just sat in the F+E tank for a couple of weeks while BG got its whotnot in gear). I do not know if it is a full dose, but the water in the tanks is an interesting shade of ditchwater at the moment. (I am guessing there is/ was a fair bit of crud in the system, despite the rads heating up properly and any 'bleed' water being nice and clear until the x400 arrived).
I was happy to let the x400 do it stuff for a bit and then drain/ refill.
However, I am now getting an odd throbbing noise (a bit like a badly tuned engine idling - thrum-thrum-thrum) in my bedroom radiator and to a lesser extent a nearby one. It starts around 30-45 mins after system start. It lasts anything from ten minutes to an hour, rising in intensity and then easing off, finally stopping - but comes back every now and then.
Both boiler and pump sound normal (silent in the pump's case) while this is happening.
I thought it might be the pump grinding, but the BG man (the same guy who fixed the original problem) reckons it is scale (and therefore not covered by Homecare). Does this sound right?
I was thinking of leaving the x400 to do its stuff until after xmas (time!) and then having a crack with Fernox Heavy Duty Restorer or similar.
Anything else (or better) I should do/ expect?
(It is an old system with an old Apollo Fanfare boiler - late 80s council installation)
Thanks for any advice,
Ian.