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jef612 t1_iwwg8ad wrote

https://viessmanndirect.co.uk/files//cf26e1c5-3b9f-43ed-980e-a31c00abe9a2/WS3C%20333-F%20Installation%20Service.pdf

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Page 8 shows you the fill valve. You would have to trace from there to see where it is connected.

air locks can be tricky - you may still need a tech there

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chunderilla OP t1_iwy69fn wrote

Yeah I just read that and thought exactly the same! Thanks for the link!

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