Hello all, I have a Quadra Fire 1200 Classic Bay issue after startup. It feed pellets and ignites fairly quick, but goes into shut down after the startup faze ends with a red light in control box. How do i know if its the thermocouple or the vacuum switch that's my issue? I cleaned the hose and shoved the thrmo back in the porcelain finger...Any ideas? Stove is possibly 16 years owned by previous home owner. Just replaced the Combustion fan and auger motors. Door gasket is also replaced 2 years ago.