Can anyone tell me what the voltage should be going to the thermostat? I have a very old Gas floor furnace. First year I moved in I had to get it fixed. Had to get some kind of solenoid replaced. Second year worked fine. Now on third year and heater won't come on. Its doing the same thing... I adjust the thermostat for it to come on but I don't hear the clicking noise to start the furnace. The pilot light is lit and the other valve is open but no flames from the manifold. Just the pilot light. I checked the voltage at the thermostat and it reads 3.4v on both wires. Is that right? Shouldn't one wire be 0v and other have voltage? I don't want another $200 charge for just a simple solenoid. Please help. Thanks

You might have a milivolt system. If you jump the two wires for the thermostat the furnace should come on. If the furnace does not come on then you will need to check for another failed component. I believe a milivolt system is 750 milivolts operating current. You might post some pictures of the system so we can tell exactly what you have.