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Keep getting 04 code on linea 24 drained pump from car tyre type nipple then repressurised exp. vessel (a tiny amount of water came out when i pressed valve,before i re filled,now just air comes out) to 12 psi but when i switch on it comes on for a second or two light green then turns red with...

yesterday i changed a themostat control on my radiator because the old one had a slow leak,which i thought was the problem causing my pressure to slowly drop.I took off the old rad valve and drained of the water,then fitted the new one,when i filled up the boiler again it made a hell of a noise...