Resideo AT140B1016 Transformer 323055-751 or a clogged flue pipe

or a clogged flue pipe due to debris or bird nests

Optimized Cooling Performance: Delivers the precise airflow required to maintain low dew points and protect downstream pneumatic tools

With a 240-second stroke time

which is critical for reducing flue gas temperatures and minimizing heat loss

Easy Installation: The plastic box enclosure features an easy open/close latch system

Resideo AT140B1016 Transformer 323055-751 or a clogged flue pipeThe Resideo AT140B1016 is a heavy duty, foot mounted HVAC control transformer engineered to provide steady low voltage power for demanding residential and light commercial applications. This unit efficiently steps down 120V primary power to a 24V secondary output, making it a critical component for powering thermostats, gas valves, relays, and integrated furnace kernels. Rated at 40 VA, it offers more than enough overhead for modern multi stage