Have a question about boilers for homes

That (taco air scoop) appears to be a 3 way valve aka by-pass loop. I'm not seeing any control valves I'm familiar with.

 

Isolate each circulator valve and have the unit call for heat.... I'm willing to bet one of the pumps is about to take a shit soon. Try that first.

It's tough to say for anyone since we're not there to hear/see it... good luck.

 

yeah, I know. I was just hoping someone on here had heard this before, so I didn't have to keep spending 100 bucks per service call.

And I hope the circulator pumps doesn't take a shit soon, cause if it does it should be under warranty. They were only put in 4 years ago, along with the boiler, as a condition of buying the house.

 

Cool boiler thread. Hope ya get it solved OP.