Furnace Not Working

[JohnO]

I hear what I believe to be the circulator continuously running and the pilot light is on. However, I cannot get the furnace to run and I am not getting any heat. I know that the contacts are closed in each zone.

There is a little (what looks like a) bleed valve and it is leaking a little hot water. The hot water in all the faucets is good.

That is the only thing that I can see is wrong. I will try to get a photo.

Any help in the interim would be appreciated. Thanks

[jadnashua]

John, circulators and zone valve imply a hot water boiler. Is that what you have?

In a boiler, there are numerous safety monitors. Low pressure, high pressure, over temp, flame sensing, and more if it is a closed system like vacuum caused by the forced induction system. Any one of those safety interlocks could prevent the system from operating.

If you are fairly handy and own either a test light or a multimeter, and can find the wiring diagram, you can isloate what is preventing the system from firing.