I am working on a Carrier 58SXA080 100 JG that is not getting power to the Inducer. I have 27V to W and to the Inducer Draft Relay on the Red wire through the Limit. I have 115V to the IDR also, but nothing coming out to the Inducer Plug. The NC contact on the Pressure switch is closed and the limit is closed. I assumed that the IDR was bad.

I replaced the IDR board and the system started. I cycled with the t-stat and everything ran great. On the third start-up it gave the same problem. I can't find any shorts or odd voltages to suggest something shorting the board. I checked the limit again and it was closed. I have 27V and 115V to the IDR.

Any ideas?