Grundfos stn pump 3 bar problem

[reuben123]

Hi. Had this for 7 years. Worked flawlessly until now.
Often when turning hot or cold tap on or shower, the pump will not start, it just buzzes loudly . To get it to work, the power is turned off then on and it works fine then.
It is intermittent.
Do you think its electrical or pump fault?
I checked circuit board and can see a relay. You reckon it could be that?

Thanks

 

[just pumps]

Capacitor would be my first point of call however if is noisy then could possibily be bearings are worn after 7yrs.

 

[reuben123]

Capacitor would be my first point of call however if is noisy then could possibily be bearings are worn after 7yrs.

Thanks. I noted it was s 12uf capacitor. Who would sell these particular types, plumbing shops?

 

[just pumps]

Thanks. I noted it was s 12uf capacitor. Who would sell these particular types, plumbing shops?

Buy online, just type 12uf capacitor and find one with the same connections.

 

[oldbuffer]

Make sure you get a motor capacitor, not an electrolytic. E.g. https://www.amazon.co.uk/RUN-START-CAPACITOR-12-5-INTERHOME©/dp/B0744GFLDS

 

[reuben123]

Ordered capacitor. Same size 12uF. Checked using multimeter, reading approx 11uF. Checked original capacitor, reading approx 6uF. Replaced capacitor.
Working great now.

Thanks for help.