No heat. System was calling for heat when I arrived. System would cycle but igniter would not fire. Checked filter, ok. Checked drain line and found line obstructed. Cleared obstruction and found some water in pressure switch lines. Cleared pressure switch lines and system fired. Cycled several times. System operating normal at this time. Unit is in need of cleaning and maintenance. This will help from drain gett8ng clogged again. Recommend cleaning. Job complete.