i have same trouble too, i removed a rad to plaster behind it but when replaced it and opened valves i couldnt get heating or rads to work, removed big screw from pump but propeller was spinning so replaced screw, i think it maybe air lock somewhere, how can i find it please

andy k, December 2007

Hi Andy
When you removed the radiator did you drain the whole system or just the one rad.

What type of boiler do you have?

D.R., January 2008

should be an air bleed plug or valve on ea. rad. on the ends towards the top.some have auto air bleeders, usually just loosen a turn or so . can hear air releasing, like flat tire. start at bottom one that is col and go up 1 at a time. may have to repeat several times to get right. valves lime up and dont work . just remove clean and reinstall. make sure pump off first.

ck, December 2007