Pump noise Grundfos

[Rbanksy]

Can anyone tell me what the noise probably is with my pump, it's not extremely loud but is irritating. Its a hum/vibration.

Turn the volume up when watching.

I have tried:
1. Reducing the pump to low which makes it slightly better but not much.
2. Bleeding the valve, small amount of air hissed out but same problem
3. Bleeding the radiators

 

[Gasmk1]

Possibly on its way out could be bearings easy enough swap

 

[Rbanksy]

Possibly on its way out could be bearings easy enough swap

Cheers I have actually just replaced it with a UPS3 which hae corrected the problem.

I just dont know whether to leave the new one on constant curve II or put it on proportional curve I or II

 

[ShaunCorbs]

Bearings in the old pump worn

Constant 2 on the new ups3 if your on a gravity system make sure it’s not pumping over on hot water

 

[Rbanksy]

Bearings in the old pump worn

Constant 2 on the new ups3 if your on a gravity system make sure it’s not pumping over on hot water

It's a sealed megaflow system and I believe has an automatic release valve which seems to rule out proportional

 

[ShaunCorbs]

Leave it on 2 then if it’s heating all your radiators up etc

 

[John.g]

It's a sealed megaflow system and I believe has an automatic release valve which seems to rule out proportional

What is the automatic release valve?. Is it a automatic bypass valve?.