vaillant ecotec pro 28

Hi, Moved into a flat with a broken knob that controls the radiators. Estate agents were useless so was forced to do a self repair. Ordered new knobs and followed this procedure to the letter - Once I turned the boiler back on, it just says "0c" and no longer have hot water or heating...

Hi my boiler lost pressure due to a leaking radiator. Does anyone know how I can repressurise please ? I don't have the manual from when I moved in. I have identified the loop but there is only 1 valve that I can turn. Any guidance would be appreciated it. Complete novice here !

My boiler screen is showing an f22 error and the pressure is low. Could the two things below be the bits that I need to turn?

Hi, it sounds like a bee, happens intermittently with rads on only, goes off when you open hw tap Video - https://drive.google.com/file/d/1eGBfQHfTCeM7s8z51rV2yhXCyRC2AppK/view?usp=sharing Thanks

My boiler is showing only 0.5 bar when not in use. I followed a video from Vaillant to re pressurise it using the loop, but nothing happened. The little plastic bit had broken off, so I did it with a spanner. In this video the loop seems to go from different pipes than on mine... Any ideas?

Hi, could anyone advise me how to connect salus 520rf to vaillant ecotec pro 28 combi??