Right, just had my loft converted fitted a towel rad filled the rad & turned on the heating brought the pressure back up to correct position. Everything fine towel rad nice and hot, just by chance went back upstairs about 3-4 hours later towel rad stone cold but the heating was still on and every other rad in the house red hot??? left the heating on another 3-4hours nothing. Got a plumber round he turned all the rads off turned the heating on and bled the rad till the water was hot re-connected pipe great rad red hot turned the other rads in the house back on everything ok. 2-3 hours later towel rad stone cold all other rads red hot I am close to ripping it off the wall PLEASE ADVISE