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Yes but I only work on commercial stuff like CHP engines and industrial boilers I currently maintain the CHP engine and boilers at a prison. My knowledge of domestic stuff is limited I'm currently thinking it's either the gas valve or the PCB

hi i have a vailiant turbomax 828e i have a problem with the ch with the heating set to any temp it always seems to modulate 4-5 degrees below set point and not meet set point and shut down. with a set point of 82 degrees gas valve opens to 1.9mb ignition rate then opens to 9.8mb full rate...