Grundfos Pump - has it failed?

[Marnhullman]

My Boulter Buderus Camray boiler has shutdown and I think it may be a failed pump. It has a Grundfos UPS 25-60 pump fitted and I removed the large screw to check if the impeller was rotating. From past experience I would expect a steady, but not powerful, stream of water to run from the bottom of the screw hole but I am getting a thin, powerful, jet of water coming straight out of the middle of pump shaft - it almost looks like there's a hole or depression in the middle of the shaft - there is no keyway so I can't use a screwdriver to try to free it up.

When there is power to the boiler it sounds like the pump is running but as soon as the boiler is actually switched on it locks out.

Grateful for any advice.

 

[Agile]

You need to see if the pump is rotating.

It has a screw slot with sloping sides so that it does not cause any injury! Other makers dont seem to have that problem.

But you can still feel if its turning.

You should also be able to turn the shaft when boiler is off.

See this site FAQ about testing pumps.

Tony

 

[Marnhullman]

Thanks for feedback. Am calling heating engineer as I can't identify the problem.

Regards