There is two small fuses in the pull out box under the switch. To the left of the switch is four fuses. The bottom fuse is the ceramic fuse and the three above the ceramic fuses are smaller fuses. I had the ceramic fuse tested and it was OK. I looked at the other fuses and did not see any burned spots on the glass fuse capsule. I may replace them anyway and see if it corrects the problem. If it is not the fuses what else could it be?