I have a furnace/coil that for the past 3 years has been blowing the 3 amp fuse on the board 2-3 times an entire heating season. (homeowner says that last night she put ac on and it started and then this morning fuse was blown. That's first time is blew in ac mode) I have checked voltages, amp of gas valve, shorts to ground, and cannot find any issue. The board was changed last year for other reasons but it had been shorting before that. Does anyone have any suggestions of what to check next? your help would be much appreciated. Michael.
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