Hi. I'm Smitty. I am a professional appliance repair consultant here to help you diagnose, and repair, your appliance.
You probably just have a fuse out on the main control board.
The control board is located under a black plastic cover at the back of the unit to the left hand side. It is held on by a couple of hex head 1/4" screws. Remove the screws and there are two fuses under the cover. Make sure they are good and replace them as needed.
If the fuses are ok please let me know and we can go from there.
Thank you for trusting me with your problems. The Home Smithy
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Yes, it is at the back of the unit. There should be an access door to get to it.
Let me know what you come up with. I'll be here tomorrow after 12:00 PST.
I appologise for not replying. I was ill yesterday and still not up to snuff.
Please provide the model number of your unit and I will get you a complete service manual to work from.
I find it strage that you are unable to access the control board though. The board is in direct alignment with the burner manifold. The manifold requires ventillation so there has to at least be vents there.
Here is a picrture of what the box looks like.