is this a faulty FCU?

No, I just saw you edit the post and you're right. Which possibly throws that theory out of the window.

Yep the tool is probably not ideal. It's surely only as clever as the person using it, which in my case would be inconclusive. The smartest person would probably throw it in the bin. It's had its uses and given me consistent results if nothing else. (No, not consistent crap lol....)
 
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The tester has its uses, it looks like it does continuity,
When you remove the FCU tomorrow you can check continuity through the switch L-L and N-N for peace of mind
 

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