Check power to the pump.
SOURCE: Noise from hot water circulating pump
could you have gotten air into the line and now the pump cavitates?
Testimonial: "Thanks a million. Makes alot of sense. How do we get the air out?"
SOURCE: My grundfos circulation pump does not seem to be
it's possible but not all that likely. The sump pump is pumping dirty water and the domestic water should be clean.
SOURCE: pump will not run when it is hot
Metal heats as it expands so if you have a fit that is tight to the maximum tolerance cold it can be rubbing as things heat up. If a motor is running inertia helps keep it going while the system heats but then it stops and once it has to restart, it can not develop the extra torque needed to get rotation started. Check for things such as sagging motor mounts on the pump motor, a worn bearing fit in a pump shaft or impeller assembly or a damaged wear ring inside the pump housing. Any sign of a rub would show you what to fix. It would be helpful if you clarified what brand and model the pump is and whether the whole unit was replaced or only a portion of it last year if these suggestions don't solve your problem.
Hi,
Here is a tip that I wrote about heating circulator pump problems.
It will give you the information you need to learn about your circulator pump problems and solutions for it.
Heating Circulating Water Pump Problems
heatman101
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