Removing 2 radiators for gas central heating for decorating. Turned off thermo valve, turned off lock shield valve. I then checked with the air valve and all ok. I then removed the the thermo valves. And when the heating came on water pissed out the thermo valves. Did I incorrectly remove the thermo valves and should I have kept them in place to keep that valve shut off?
Checking before I let the heating run tonight.