Issue fitting Worcester fitting loop

28 Dec 2021
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United Kingdom
I have a Worcester Bosch Junior 24i boiler and am adding a fitting loop. An issue I am having is the that I am unable to turn the blanking plugs. Is there anything that could be causing this?


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Are you supposed to turn those? What filling loop are you adding?
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This is the one i have and these are the instructions telling me to remove them
All I can think of is some deposit on the thread. Some white crud is visible in the pic.

I assume the system is drained?
How has it been filled up to now?
If it's a new job (but doesn't look like it with the white stuff) I'd have thought the installer would have taken care of it.

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