DIYnot
Local | Network
   DIYnot > Forums
Local | Network
DIYnot Network Local DIYnot Network Local  
  Forum IndexForum Index     RulesRules    HelpHelp     Join FREERegister Free     About CookiesCookies     SearchSearch     LoginLogin 

Failed capacitor on Grundfos pump?


 
Post new topic   Reply to topic    DIYnot.com Forum Index > Plumbing and Central Heating
Search this topic :: View previous topic :: View next topic  
Author Message
Odyssy

from United Kingdom

Joined: 02 Sep 2004
Posts: 34
Location: United Kingdom

PostPosted: Wed Nov 03, 2004 9:49 am Reply with quote

Conventional vented system, the pump isn't running. I've removed the vent plug and cleaned the debris out - shaft was turning freely. There is power at the pump and I've tried tapping it with a hammer.
The only other possibility other than replacing the pump, is that the capacitor has died. The system has been noisy on start up occasionally over the last couple of weeks with hammering and boiling over into the header tank, although the pump usually started. The pump is a grundfos UPS 50-15x18. Any thoughts gratefully received. Thanks
Back to top
 Alert Moderators

If you do not want to see this advert, click here to login or if you are new click here to join free.
ChrisR

from United Kingdom

Joined: 24 Jul 2003
Posts: 23282
Location: London,
United Kingdom
Thanked: 1036 times

PostPosted: Wed Nov 03, 2004 1:26 pm Reply with quote

Measure the resistance of the windings, L - N, which shouldn't be zero or infinite. A 5 multimeter would do it.
Cos I'm a smartarse I'd measure the capacitance of the capacitor icon_cool.gif

They do fail, but yours is quite an old pump so probably worn anyway. Wilo's are bad for blowing capacitors, Grundfos not so often.
Back to top
 Alert Moderators
Odyssy

from United Kingdom

Joined: 02 Sep 2004
Posts: 34
Location: United Kingdom

PostPosted: Wed Nov 03, 2004 3:27 pm Reply with quote

Chris - thanks, you were right - capacitor dead. I've replaced the pump anyway and the improvement is quite amazing - the whole system is much quieter, the old pump must have really been on it's last legs. I don't think I even need to replace the boiler - no kettling! Yippee!
Back to top
 Alert Moderators
Search this topic :: View previous topic :: View next topic  
Post new topic   Reply to topic    DIYnot.com Forum Index > Plumbing and Central Heating All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Similar Topics   Replies   Views   Posted 
Stuart Turner Showermate shower pump start capacitor 2 40 Thu Sep 06, 2012 7:15 pm
Pump Capacitor 16 440 Fri Feb 11, 2011 7:23 pm
Pump or just capacitor? 46 1380 Sun Apr 28, 2013 10:38 pm
pump motor capacitor - where can i get one? 14 920 Sat Nov 21, 2009 12:46 pm
Pump capacitor causes earth fault 9 200 Fri May 17, 2013 8:55 am


 
DIYnot
Find an Expert | Find a Supplier | Search DIYnot.com
Network | Advertising | Newsletter
DIY | DIY How To | @home | DIY Wiki | DIY Forum
By using this site you agree to our Terms of Service / Disclaimer.
Please read our Privacy Policy. Copyright © 2000-2014 DIYnot Limited.