I have a newly installed Leakshield. It was working fine when I installed it yesterday, but this morning it is showing a state of "unprotected." It seems to be pulling and holding good vacuum. What should I be looking at to resolve this?

The loop is a simple one with a single D5 Next pump on an Ultitube 150 (Leakshield is mounted on top of the Ultitube), a Highflow Next, a couple of rads, and a trio of [Aquacomputer] blocks.

Naturally, this has resolved itself just a few minutes after I post :-)

Showing unprotected again. Is this normal? What should I be looking at if not?

Ah, ok. I do have the pump set to vary the speed based on temp (just a coolant temp setpoint on the D5). It's a somewhat restrictive loop, so I see a difference in coolant temp during periods of high load if the pump isn't spinning fast enough.

I can raise the minimum pump speed so that there is less variation. The loop is pretty well purged (I think), but I will also try doing a vacuum fill once I get some additional DP Ultra delivered just in case there's still some air stuck in the rads.

It's definitely possible that the loop isn't super tight. It has a pair of Alphacool QDCs which may be leaking, as well as a few hard tube fittings which I might not have gotten completely tight. What is a normal amount of LEAKSHIELD pump activation?