Downstairs rads taking ages to heat

[SJB060685]

Could be a pump problem, the upstairs radiators heating up through gravity circulation.

 

[Frosty7]

Could be a pump problem, the upstairs radiators heating up through gravity

 

[Frosty7]

I think you could be right. It’s a Grundfos 15-50. It’s been quite noisy for sometime. I just tried bleeding it by undoing the centre bleed screw and the pump stopped. As I tightened it up it was struggling to turn (the pump I mean)
Had to find a sweet spot where it doesn’t leak out of the bleed screw hole and the pump turns. That’s not right is it?

 

[Frosty7]

Could be a pump problem, the upstairs radiators heating up through gravity circulation.

think you could be right. It’s a Grundfos 15-50. It’s been quite noisy for sometime. I just tried bleeding it by undoing the centre bleed screw and the pump stopped. As I tightened it up it was struggling to turn (the pump I mean)
Had to find a sweet spot where it doesn’t leak out of the bleed screw hole and the pump turns. That’s not right is it?

 

[Ben-gee]

No. Time to replace the pump then you’ll be fine.

 

[Frosty7]

No. Time to replace the pump then you’ll be fine.

Ok. Thanks everyone. Couple of final questions. Where is the best place to get a new Grundfos 15-50 pump? And I take it I will only need the pump. No need to replace the housing with the unions? Also how much? I see them ranging from £160 - £250

 

[SJB060685]

If the pump is rotating sometimes then you MIGHT and im not saying do but might have a weak capacitor.
Probably best to replace the whole pump though to ensure future function.
I would change the pump valves at the same time.

 

[Frosty7]

Ok. Thanks everyone. Couple of final questions. Where is the best place to get a new Grundfos 15-50 pump? And I take it I will only need the pump. No need to replace the housing with the unions? Also how much? I see them ranging from £160 - £250

Ok. Thanks everyone. Couple of final questions. Where is the best place to get a new Grundfos 15-50 pump? And I take it I will only need the pump. No need to replace the housing with the unions? Also how much? I see them ranging from £160 - £250

Ok. Thanks everyone. Couple of final questions. Where is the best place to get a new Grundfos 15-50 pump? And I take it I will only need the pump. No need to replace the housing with the unions? Also how much? I see them ranging from £160 - £250

If the pump is rotating sometimes then you MIGHT and im not saying do but might have a weak capacitor.
Probably best to replace the whole pump though to ensure future function.
I would change the pump valves at the same time.

Sorry but what it the capacitor?
And the valves your are talking about are they the ones directly above and below the pump?

 

[SJB060685]

A capacitor is a device that helps start and run the motor. Yes the valves above and below the pump are best changed as well, they're notorious for leaking if you touch them.

 

[Aquarius]

Probably a Grundfos ups pump might be needed now, as they’re all energy efficient products now. About £85-100