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I live in California in an area that doesn't really need A/C so all I have is a gas furnace for heat (York Diamond 80). Heat worked fine last winter and never used the unit at all from about June to October and then when I tried turning it on in October got nothing. Checked it and the 3 amp fuse in the control board area was blown. I replaced that but got nothing so I turned an "on/off" switch in the unit to off and back on and still nothing, then jumped the heat and power and it turned on. Removed the "jump" and thermostat operated it fine. Not sure but my guess is something had to "reset" for it to work. So it worked fine for about two months than last night we had a rain storm and had one or two instances of the lights dimming for a split second. Woke up in the morning and no heat and not really sure when it went out. Anyway same 3 amp fuse blown so I repeat the process and its working fine again. But I guess the point is if that fuse blew twice now is there another issue or is it just a power surge? Should I put in a power strip to plug into instead of directly from outlet to furnace? Should I wait to see if it happens again? Should I change it to a 5 amp?