Called out last night after cleaning due to noise heard at furnace and system not heating. After monitoring operation, water sloshing was heard at inducer motor. Verified secondary trap was cleared fully and found drain line kinked entering main line in crawlspace causing positive pressure on drain line preventing drainage. Fixed temporarily to provide heat for this evening. 10/28 returned to reconfigure secondary drain situation. Tapped into condensate line and added barb fitting for secure connection. Verified system operating properly at this time. No charge for visit due to how drain was originally ran.