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@AGAS As i said it is highly rusted and would not come off and i do not want to ruin the thread but anyways I will try and update this post. Thanks

Already purchased the AAV. Looking for right method to unsscrew the rusted AAV on the boiler.

@ianmcd It leaks water sometimes, so it needs changing. I have bought the part but the one on the boiler is rusted and would not come off easily.

@The831Bunny Thanks for the reply. Already fixed that issue. The air vent(pic attached) needs replacing but it is too rusty and would not unscrew. Any suggestions on how to go about it?

Update - The boiler is working fine for now. I greased the pin on the differential valve and no problems so far. Thank you guys for your suggestions. The air vent(pic attached) needs replacing but it is too rusty and would not unscrew. Any suggestions on how to go about it?

Yes Bunnyman you are right. There are many sellers on ebay who stock the parts for this model. I managed to find the fault. It is in the differential valve. I removed the differential valve(pic attached), cleaned it ,diaphragm was in a good condition, the pin inside was rusted, so i cleaned it...

Thank you everyone for the advice.

Model - Vaillant VCW sine 18 T3 WF H

They still sell parts online though.

Hello bunnyman.They still sell parts online.

They all have one thing to say i.e get a new boiler

Hello Algas. I did find that black rubber tit. I pressed it while it was off and also pressed it while it was on.Is there a right way to do that?

Hello algas. Which square box? could you please point that out from the pics I posted. Thank you

Hello muggles. How do I check if it has power going to it? It does switch on and ignite. Whenever i turn on the hot water tap i can here some clicks going on inside the boiler.

Hello guys. I use Vaillant sine t3w combi boiler and the will not fire up when a tap is opened nor does the Central heating work. Any experts in here . I have attached pics. Thanks