What happens if I skip the annual service on my syncFURNACE?

The two most likely outcomes are a lockout and a shortened service life. The condensate trap blocks, the trap pressure switch opens, and the unit faults on ALM 3, usually on a cold night. Scale builds in the heat exchanger and efficiency drops. Gradient’s manual is blunt about the stakes, stating that failure to properly maintain the product may result in serious injury or death, because the maintenance schedule covers combustion and venting.