Just as a little troubleshooting I switched it over to pour over and it's still doing the same thing so I don't think it's related to the water pressure. Is there a boiler fill sensor that might be acting up?
Well, I let things cool down and wiggled the little plunger in the vac breaker around a bit . The second time it actually closed after letting a more than usual amount of water out but it didn't stay open this time like it did the first few times.
The third time it closed without letting any water out...just steam. So it looks like it's a bit sticky.
I'm going to do a long overdue descale and see if that helps before I think about replacing the vac breaker.
On another note, so far it looks like the pressure reg has solved the weird behavior of the boiler pressure gauge. It's a little too early to be sure since it was kind of intermittent but hopefully it's all good now!
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