Central A/C trouble shooting - Victory!

[Slide Panda]

Again, thanks to all who chimed in with their knowledge - This is one of the things that made the DML (may she rest in peace) and this place so cool.

Occams Razor applied here and it was a fuse.  Seems to have been one on the air handler, but I replaced the ones on the handler and heat pump.  But one of the air handler fuses had what looked to be a bit of heat damage.  I say looks since these are the big honker FRN-R 40 250v tube jobs.  There's no filament or anything you can just peek at.

Either way, after the new fuses were in, I turned the breakers back on, then the thermostat and on she went.   

[MikeZ]

Glad you got it running.
Now the big mystery.
What caused the fuse to blow?

[Slide Panda]

Yeah - actually I was going to pose that question to you - any thoughts?

The fuses were old... is to possible for them to fatigue?

[MikeZ]

if the unit short cycled (on and off quickly) that can cause a fuse to blow.
I'm assuming it hasn't been down for a while and blew during a storm or you haven't been doing home improvements and messed w/ or hit the wiring somehow.  Might want to check the wiring outside going to the condensing unit.  Sometimes animals will eat at the wiring and cause it to short out.