Central Heating

Radiator making gurgling noise after being bled and reduced lockshield valve

Anonymous user 23/02/2024 - 3.28 PM

Gas boiler, water tank fed system from loft. Everytime i turn on my heating, one of the radiator in my flat is making a loud gurgling and rattling noise. I have bled all the radiators and only clear water comes out and have also tried to balance the system and reducing all the lockshield valve to only half a turn but the radiator is still making the noise everytime the heating is turned on and continuously in segments during the duration the heating is on. Any idea what the issue might be and will it be a quick job to fix or worth calling out an engineer (on the homecare policy so will only need to cover £60). Thanks all in advance!