Found furnace running on arrival. Inspected system errors and found EEO error code ignition. Retry error. Removed and cleaned burners, found loose ground on burner cabinet - tightened. Inspected propane and venting systems. Checked all wiring. Cleaned flame sensor. Checked drain switch and other pressure switch and measured pressure at -1.7 compared switch rating at -1.2 inches. Measured pressure with door on and off. We did experience an issue at first start, but could not replicate after work was performed.