Grundfos pump making unusual sound/boiler not coming on

[ShaunCorbs]

No should be powered / running

 

[Stephen JW]

No should be powered / running

Thank you! I will try that again then.

 

[Deleted member 120897]

If it springs into life when you try it with power on, then new capacitor or pump required.

 

[Stephen JW]

If it springs into life when you try it with power on, then new capacitor or pump required.

Just tried that. When I removed the centre screw the impeller screw head was visibly turning but the pump was still making the same abnormal sound and the boiler is not igniting. The same sound can be heard in the boiler cupboard. Difficult to describe but it sounds as though water is trying to circulate around the system but certainly not running smoothly. The pump is old, would it be practical or indeed sensible to replace the capacitor only, or would it be wiser to replace the entire pump assembly with a new one? Many thanks

 

[exedon2]

Time to move on and change pump
Dab evosta 3 is our replacement pump of choice.
Better price than grundfos and Dab is owned by grundfos!

 

[ShaunCorbs]

Time to move on and change pump
Dab evosta 3 is our replacement pump of choice.
Better price than grundfos and Dab is owned by grundfos!

Can’t it’s inbuilt to the boiler and has to be original

 

[exedon2]

Op says in #6 pump is in airing cupboard

 

[ShaunCorbs]

Op says in #6 pump is in airing cupboard

Video shows the pump in the boiler

 

[Deleted member 120897]

Video shows the pump in the boiler

It’s a YouTube link showing a repair (general video), hence why steadyon mentioned Vaillant, boiler is potterton.

 

[Stephen JW]

It’s a YouTube link showing a repair (general video), hence why steadyon mentioned Vaillant, boiler is potterton.

Video shows the pump in the boiler

Apologies for the confusion I have unintentionally caused by posting the link to this YouTube video. I linked to this as a reference to something I had already tried to free the impeller. I hadn't realised that the link and video 'thumbnail' would appear as a huge image within the post!