Search the forum,

Discuss Grundfos water circulator not circulating in the Water Underfloor Heating Advice area at PlumbersForums.net

Messages
15
Hi, I have a Grundfos UP15 42RUC7 circulator which doesn't appear to be working. the impeller moves freely when I spin it manually but when there is power tot he device all I hear is humming but the impeller doesn't turn even though it does not appear to be stuck. Also, oddly I can not find my model # anywhere for this Grundfos. The closest I have found is UP15-42BUC7 but you can see clearly in the picture I have attached that my model is an "R" and not a "B". Any help would be appreciated. As mentioned - power appears to be at the unit and the impeller is not turning even though I can spin it freely by hand - thanks

IMG-8613.jpg
 
what does it feed the only difference with B will be it is Bronze impeller used for hot water seconday circulation
 
Nope-but wouldn’t the impeller still spin even if the capacitor was faulty with power running to the unit and you can audibly bear the unit humming?

A humming/buzzing noise is typical audible sound of a cap failed or a seized motor. The motor will spin by hand as it is with a failed cap but trying to start a single phase motor without an auxiliary winding and a cap is impossible, once rotating it would be fine but not to start.
 

Reply to Grundfos water circulator not circulating in the Water Underfloor Heating Advice area at PlumbersForums.net

Creating content since 2001. Untold Media.

OFFICIAL SPONSORS

OFFICIAL SPONSORS

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock