ok so i dont work on a lot of these but on a service call for no heat,

The pilot lights and stays lit, it puts out voltage to gas valve at around 105Ua, checked the t-stat and it works and i jumped it out just in case and no gas will come out of valve and I also cleaned the the thermocouple and checked all limits.. all seem to be working yet no gas coming from valve.

So two questions how many micro amps/volts does it take to open the valve and what is the reading supposed to be coming from a flame generated sensor?

Im pretty sure its the gas valve but just double checking..thanks