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Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need.
Are the burners lighting at all, even if only briefly?
have you tried cleaning flame sensor?
Are you getting 24 volts to the valve after the ignitor lights up?
What kind of pressure is coming out of valve in inches water column?
We should be getting 3.5 inches water column on outlet side of valve when valve gets 24 volts. Yes, it's possible orifices could be plugged.
If the pressure is low, this would prevent it from lighting.
We can't assume anything. Just because the one next to it works, doesn't mean there might not be a problem with this furnace.
If the valve has 24 volts (and it's good), there should be a certain pressure from the outlet side of gas vlave (3.5 inches WC)
If you can get me that reading, we can go from there.