Boiler Issue - Only turns on when front panel is removed

[Spires]

Hi everyone,

I've searched high and low for an answer through Google but can't seem to find the answer.

We have hot water radiators and in floor hydronic heat, with a gas powered boiler. We've awoke with no heat for the past few mornings. We thought it was the thermostat so we've replaced it. But now we think it is an air circulation issue. When the boiler is not turning on when it's supposed to, as soon as I remove the front panel, it fires up. I've tried leaving the door to the furnace room open, but that isn't enough. It will only work when I remove the front panel.

Does anyone know what might be cause this?

Thank you!

[Joehvac25]

Is it a high eff with 2 PVC pipes, one intake one exaust?

[jtrammel]

What's the model and serial # of boiler? Is it a sealed combustion 90+% boiler or an older model?

[Spires]

Here is a photo. I'm not sure of the model number but is about 8 years old and it's NOT high efficiency.
Thank you!

[Spires]

[bobboan]

Might be a venting issue. You need to get a pro to look at it right away. A dangerous condition may exist.