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Either a short somewhere---which fuse? The one at the power cord or what?
Other possible reason is wrong fuse----many of the fuses in these sets are special-----if you go and buy some Generic ones--hardware store or Radio Shack the fuse even with same amperage/voltage rating may blow at turn on instantly for no reason------
Please, never try to replace a fuse, without checking for any short circuit inside. You will only increase the damage inside. It is advisable to call in a qualified service technician as opening back cover by unqualified personnel is hazardous.
you have a short most likely on the power supply but could be on the mainboard, inverter board, av/input board. The T-con board is fused and should blow its fuse before blowing the fuse on the power supply. I'm going with a faulty power supply, most likely a shorted Mosfet.
Check at the furnace there is a 3 amp fuse on the circuit board you might have blown it when you installed the t-stat without shutting power off to the furnace. Also make sure RH and RC are jumpered together Y= cool G=fan W= heat R=power. let me know ok
When a fuse keeps blowing, that is an indication that some component has failed and the circuit is drawing too much current. Most likely it is a problem in the power supply section or high voltage / flyback section.
Sorry to say, you will need to take it to be serviced.
Please let me know if I can be of further assistance to you.