I am wondering if the problem may be due to scaling as I live in Oxford with very hard water. If the pump needs descaling, how do I do it?
Thank you
qim
Grundfoss Pump probably stuck. I saw this link and would like to try
//www.diynot.com/forums/viewtopic.php?t=103104
but I'm afraid that on takinbg screw out a lot of water will run out of boiler. Is that not so?
Thank you
qim