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Laars Endurance EBP 110 - burner randomly kicks off

initram Member Posts: 15

It seems like it's become an annual event, where my Laars boiler decides to challenge my patience... especially just before winter hits. :(

The problem I'm having is most noticeable when there is two simultaneous calls for heat (DHW or radiant). Example, someone is taking a shower while the dish washer is running. Or two zones require heat at the same time. The boiler will fire-up without a problem, but what happens is that the burner will kick off randomly and fire back up a few seconds later. So after a while the boiler flow temperature will struggle to stay at 110-120 degrees, because the burner keeps going on and off. While this is going on, the blower never stops, the burner never fails to re-ignite, no error is shown, and it doesn't lock-out. The problem is still present even when there's only a single call for heat. But it isn't as noticeable because the boiler can still manage to satisfy the request while the burner kicks in and out. I changed the heat exchanger back in June, so I had to refill the system. Could it be air in the system causing this? Although, I haven't had a problem until now. I also started using the radiant heat recently... So maybe some air was/is trapped in the pipes?

Here is a video that may help explain the issue better than I can.


(It mostly starts acting up at the 2 minute mark)

Thanks in advance if anyone can help.