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Hi Cant get some of my rads piping hot - luke warm or warm half way only. Have tried to bleed them, seems like no air as hot clear water comes out straight away. I have taken thermostatic valves off them as I dont want them switching off when they hit the thermostat temperature. Will...

My Vaillant Thermocompact Boiler 628E, shows the error message 5.33 (maybe S.33). I rang Vaillant technical Dept yesterday who said it was the air pressure switch and I bought one for £40 & changed it myself. Guess what- it is still showing the same error code! Can someone help as its...