How to free a seized Grundfos central heating circulating pump. A similar technique can be used on most pumps. A jammed or seized pump causes the boiler runs for a few minutes then turn OFF. The boiler won't light again because the boiler heat is not being pumped away from the boiler to the radiators, so the boiler remains hot and does not need to light. A jammed pump often misleads people into thinking it is their boiler that has failed.
Published by Mike Bryant, AKA Mike the Boilerman. Website miketheboilerman.com. I'm based near Marlborough, Wiltshire. Older, classic and vintage gas boiler repairs are my speciality.Call or text me 07866 766364.