I have a Lenox forced gas A/C / Furnace the fan kicks on but only blows cold air. We had it checked out, and they said it was the ignition control module because it wasn't lighting up. We replaced this piece, and it's still not glowing. What else could the problem be?


The igniter is what I'd start with.

Updated on January 8, 2018

Original Article:

Troubleshooting Common Furnace Problems With an HVAC Expert
By Dan Robbins