I'm assuming that by "on the board" you mean F1. Unless there is an internal fault on the board it looks like it feeds:

Reversing valve
Expansion valve
Blower relay
Compressor relay

I would guess the problem lies in this group. If the fan runs, I would doubt that is it. Nevertheless, I'd disconnect on side of each of the valves and one side of the relay coils and see if the fuse holds. Then connect them one at a time until the culprit is found.

"We live in a time when intelligent people are being silenced so that stupid people won't be offended".