jef612
jef612 t1_iww85sk wrote
Just stop. Honestly you can do some pretty good damage to your system if you don't know what you are doing. You have a nice boiler there - someone in your area will be able to look at in the next week. Don't buy the labour shortage crap - keep calling until you find someone qualified to look at your system.
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Once the tech is on site - ask him to spend a few minutes with you showing you where you can add water to the system and what else you can monitor/maintain as a homeowner.
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Boiler systems are sealed, and if you are continually adding water then it has a leak somewhere that needs to be addressed. Adding small amounts of makeup water is OK, however adding water over time without addressing the leak will cause much bigger problems over time. Don't buy the labour shortage story - keep calling around.
jef612 t1_iwwg8ad wrote
Reply to comment by chunderilla in How do I bring the pressure on my boiler back up? by chunderilla
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