58PAV - I just changed the ancient Honeywell mercury thermostat with a 5-2 progammable, the same one I put in my office. Now the da*n thing won't fire. The Statue Led is ON constantly, indicating a loss of 24V somewhere. I'm sure it is a fuse, but the only one I found is a 3A automotive type. Any idea where the 24V fuse is?

Freezing in Indiana.