It's going to be a head scratcher. My Central AC was blowing 3 a fuses and in the process it damaged the digital thermostat.
I traced the problem back to the contactor coil. It was shorted out. I've never seen a contactor coil short out. An ohmmeter didn't do me any good because there was no shot to ground. I figured out the coil was shorted by using a different 24 vac transformer, connected it to the contactor and measured the contactor using 7 amps. A good contactor would use around 0.1 amps..
I damaged 2 $50 digital thermostats and 7 3 amp fuses. It was a hot Sunday. I wired a used contactor, an old Honeywell thermostat and added a 5 minute delay. I ordered a new contactor.
AC is still wired the old school way. A friend that repairs AC's told me he replaces many digital thermostats..
GOOD Luck finding the gremlin that smokes 1 amp fuses. I bought 100 3 amp fuses off Amazon for under $10. 3 amp fuses at the supply house sold for $1 each. Good thing my friend loaned me 7 fuses. I repaid him with 50 Amazon fuses.
Keep us posted when you find the gremlin. I would look around the area where your friend saw sparks. Look for a pinched wire shorting to ground.
You may want to check Amazon out and buy 100 1 amp fuses. You may need them before you find the problem..
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