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Thanks, I just had it on the default setting but after you mentioned it I've read up on it and changed it to CC2.

It's a DAB Evosta3 Circulating Pump 60/130 50-60Hz 220-240v. Power is jumping around but averaging about 20w and flow rate 0.7-1.7 m3/hr when I've checked it.

New one is a DAB Evosta 3 and it can be set to show flow rate and watts, old one was an SMC comet 2-130.

I drain down the system a few times as suggested and installed a new pump and fingers crossed the radiators are now working again. I'm going to install a magnetic filter add a system cleaner and then inhibitor. Thanks for the help.

I took off the pump there was a bit of black crud, it spun when I tried to move it and I cleaned out the flutes. It's silent and I can't feel any vibrations when it's on settings 1 and 2 but it makes a hum when it's on setting 3. It's really really hot too.

Thanks, I've drained the system once and I'll do it again. When I drained the radiator in the living room it pulled warm water from the hot water tank through the downstairs loop. Could this mean it's a pump failure?

I think crud lock is most likely since it's a reallly old system, is there any non-invasive way to tell if its any of those things?

Hello, I have a one pipe gravity fed open heating system with a potterton kingfisher MF boiler. The radiator in the living was not attched to a bracket and was being held in place by a floorboard so I decieded to replace it. I got a plumber to install the new radiator and install a drayton...