ok,,need some help on this one, i have just installed a bryant 3 ton heat pump and air handler in a town house,(new construction) when i first fired the unit it ran for several hours then blew the 5 amp fuse in the air handler,i checked all my connections and replaced the fuse,,it ran for about two hours then blew the fuse again,,i replaced the stat thinking maybe it was bad,,now the fuse is blowing as soon as i turn power on,,,i pulled the stat ran a wire from the stat up to the air handler bypassing the one in the wall,,when i turned power on display came on at 5 mins air handler came on and at call for outdoor unit it blew the fuse,,so i re mounted the stat and now ran a wire from the air handler out the window down to the heat pump,, units ran for two hours then blew the fuse,,so at this point ive been chasing wires and i cant find a short,,i replaced the defrost board and the board in the air handler,,did then one at a time and both times units ran for two hours each time then blew the fuse !#@$&!$#@*!^%(@!_!+!!!!! dont know what to do next,,,,could it be a short in the reversing valve coil? compressor contactor or in the contactores them selfs ????? cant seem to figure out why im getting a two hour run before it blows,,amp draw on the 24volt power wire never got over 0.16 any ideas????????????