Welcome! Here are the website rules, as well as some tips for using this forum.
Grundflos pump seized, got a new one fitted, it broke 2 hours later. HELP
We have a 10 year old boiler system. Our grundfos pump was slowly on the way out, scolding hot, not supplying heating to the radiators downstairs and kept seizing. We were able to unscrew the bleed valve and manually rotate the spindle with a screw driver, this solved the issue for all of 1 week.
Now the boiler ignites, heating goes upstairs then boiler cuts out after 1 minute not supplying heat to downstairs.
We had a new pump fitted yesterday, this worked for 2 hours then same thing happened, pump went scalding hot, doesn't vibrate or spin and no heating to downstairs radiators.
Please help! all heating engineers seem to be puzzled with the problem