Wet Dog Glass
The MPA is a Flame Safety System. It monitors various inputs and will shut down the gas flow if it senses something wrong. It also manages various outputs, including turning the blower on and off and opening the gas valves The error codes it displays can tell you which sensor was tripped, or at which point in the process a sensor was triggered out of order. See the Flame Safety section for a more in depth explanation of the MPA and its process.