How do I adjust the psi in my furnace. Right now the gage is reading 0, when it should be between 12-13.

The pipes under the house froze. I was able to get them fixed. But now the psi gage as I said reads zero. How do I correct this issue?

Your boiler system should have a self feed valve(pressure reducing valve). Many times they will become clogged and need cleaning or replacement. This valve feeds the boiler system to a preset psi of 12psi. This is were I would start. Good luck and please let us know how things work out.

What would this valve look like? Where would it be located?

This is on an oil burning furnace that also heats the water in my home.

Can you post some pics of your system?

Do you have any valves that look similar to one of these?

http://i812.photobucket.com/albums/zz41/druunawrench/home/furnace.jpg

Does this work?

Thanks for all you help.

Looks like the reducing valve lacks a fast-fill lever. Are all the globe valves and/or ball valves open? P.S. way to go MGD, gettin' busy wit da pics! ;)

Yes they are all open. Any suggestions?

Yes they are all open. Any suggestions?The reducing valve should have an adjusting screw at the top. You could try to loosen the locknut & run the screw in, to see if the valve will unseat & allow water in. Pay attention to the number of turns of the screw, as you will want to set it back to the original position. Keep an eye on the gauge if this works.

Sorry, where is that located on the picture I sent you.

What risks do I run to the furnace with running it at zero psi?

Sorry, where is that located on the picture I sent you.

What risks do I run to the furnace with running it at zero psi?In the pic, just below & to the left of the expansion tank. At the very least, low pressure can result in excessive expansion, noise, poor performance, & overheating. The other possibilities are even worse.