If you have the older type with gas control on front of the seat near water heater if you pop out the two screw caps remove the front (back inside seat base is just a patress box and will drop when you remove both screws.
Look at the back of the cover and all controls and wires will be there and there may be two clear glass fuses, one I think is a spare. Remove each look for one with burnt wire(blown) and if other is a spare replace the blown one and keep it to show to get a replacement fuse so you always have a spare.
hope this helps.
bob
March 2013